In the following English grammar question on voice, a sentence is given in the active voice about cooking for an orphanage. Out of the four alternatives, select the option that best expresses the same idea in the passive voice: Every Sunday my mother cooks food for the orphanage.

Introduction / Context:
This question checks your understanding of how to change a sentence from active voice to passive voice without altering tense or meaning. In the active sentence, the subject "my mother" performs the action "cooks food" for the orphanage every Sunday. In passive voice, the focus shifts from the doer to the thing that receives the action, but the idea of a regular, repeated action must stay clear. Voice transformation is a high frequency topic in English competitive exams, so following a fixed procedure is very helpful.

Given Data / Assumptions:

• The sentence is in the simple present tense: "cooks food".
• The subject and agent is "my mother".
• The object is "food for the orphanage".
• The adverbial phrase "Every Sunday" shows a habitual action.
• The passive version must keep the same tense and the same sense of repeated action.

Concept / Approach:
To change an active sentence in simple present tense into passive voice, we use the structure "is / are + past participle". The object of the active sentence becomes the subject of the passive sentence. The original subject can be included at the end of the passive sentence with the preposition "by" if the doer is important. Adverbials of time such as "Every Sunday" can appear at the beginning or end, as long as the sentence remains clear and natural. The key is to keep the tense as simple present and to use the past participle "cooked" for the verb "cook".

Step-by-Step Solution:
First, identify the object "food for the orphanage" that will become the subject in the passive sentence. Second, note that the verb "cooks" is simple present, so the passive auxiliary must be "is" because "food" is singular. Third, form the passive verb phrase "is cooked" by combining "is" with the past participle "cooked". Fourth, move the original subject "my mother" to the end of the sentence and introduce it with "by". Fifth, keep the time phrase "Every Sunday" in a natural position, for example at the beginning of the sentence.

Verification / Alternative check:
The passive sentence "Every Sunday food for the orphanage is cooked by my mother" keeps the same tense, meaning, and time reference as the active original. The focus is now on "food for the orphanage", which is what is being cooked, while "my mother" remains clearly identified as the person who does the cooking. The simple present "is cooked" correctly represents a habitual action. Reading the sentence aloud, it sounds natural and grammatically complete, which confirms that the transformation is correct.

Why Other Options Are Wrong:
Option A uses the present perfect structure "has been done", which changes both the tense and the form unnecessarily. Option B changes the tense to present continuous "is being cooked" and rearranges the adverbial in a slightly awkward way for a habitual action. Option C distorts the normal English word order and does not actually produce a standard passive construction. Only option D keeps the simple present tense correctly in passive form and preserves the meaning of a regular Sunday activity.

Common Pitfalls:
Students often confuse the present simple passive with the present continuous passive and use "is being" when the action is habitual rather than happening right now. Another frequent error is to forget the past participle and write "is cook" or "is cooking", which is wrong in this structure. Some learners also place the time expression in a strange position that makes the sentence sound unnatural. To avoid these problems, always identify the tense first, then choose the correct auxiliary form of "to be", then add the past participle, and finally adjust the word order and adverbials to sound natural.

Final Answer:
The option that correctly expresses the sentence in the passive voice is: Every Sunday food for the orphanage is cooked by my mother.