Change the voice of the sentence "No one responded to my online ad." into passive, and select the correct passive form from the options.

Introduction / Context:
This question tests your ability to convert a sentence from active voice to passive voice while preserving tense and meaning. The original sentence describes a past situation in which nobody replied to an online advertisement. In the passive form, the focus shifts from the doer (no one) to the object (my online ad), but the time reference and basic sense must remain unchanged.

Given Data / Assumptions:

- Active sentence: No one responded to my online ad. - Subject: No one. - Verb: responded (simple past). - Object: my online ad. - The correct passive voice must keep the simple past and focus on my online ad.

Concept / Approach:
To change an active sentence into passive, we normally move the object into subject position, adjust the verb into the appropriate form of be plus past participle, and optionally mention the original subject with by. Here, my online ad becomes the subject, and responded becomes was responded to in the passive simple past. The phrase by anyone appropriately replaces no one to maintain the negative meaning through not.

Step-by-Step Solution:
Step 1: Identify the object in the active sentence: my online ad. Step 2: Move this object to the subject position in the passive sentence: My online ad ... Step 3: Recognise that responded is in the simple past. The corresponding passive form requires was plus past participle, giving was responded. Step 4: Because the verb respond is used with the preposition to when indicating the thing responded to, we include to after responded. Step 5: Express the original subject no one as by anyone with a negative on the verb: was not responded to by anyone. Step 6: Combine all parts: My online ad was not responded to by anyone. This matches option A.

Verification / Alternative check:
Confirm the tense and meaning. The original sentence refers to a completed action in the past, so the passive form must use was, not is. The negative is preserved by not, and the idea that nobody responded is captured by by anyone together with the negation. Reading the passive sentence aloud shows that it communicates the same information with a shift in emphasis from the people to the advertisement.

Why Other Options Are Wrong:
Option B uses is not responded, which is present tense and therefore does not match the original past tense. Option C, Response by no one was given to my online ad, is grammatically awkward and unnatural in everyday English and changes the structure unnecessarily. Option D uses is given, again wrongly placing the situation in the present tense instead of the past.

Common Pitfalls:
Some learners change the subject and object positions correctly but forget to keep the same tense or to include necessary prepositions like to after responded. Others attempt overly literal or complicated transformations. A reliable method is to follow a fixed pattern: object plus was or were plus past participle plus by plus subject, adjusting prepositions as needed. Checking tense carefully against the original sentence is essential.

Final Answer:
My online ad was not responded to by anyone. is the correct passive voice transformation.