The active voice sentence is "Once a month we visit the temple." Choose the option that best expresses this idea in the passive voice.

Introduction / Context:
This question tests how well a learner can convert a simple habitual action in the active voice into a grammatically correct and natural sounding passive voice sentence. The original focuses on the subject "we" and the action "visit the temple." In the passive version, the focus should move to "the temple" while preserving the idea that the visit happens once every month.

Given Data / Assumptions:

• Active sentence: Once a month we visit the temple.
• Subject: we.
• Verb: visit.
• Object: the temple.
• Adverbial phrase of frequency: once a month.

Concept / Approach:
To change an active voice sentence to passive voice, the object of the active sentence becomes the subject of the passive sentence. We then use an appropriate form of "to be" with the past participle of the main verb, and optionally include the original subject as an agent introduced by "by." Because "visit" is a simple present habitual action, the correct passive auxiliary verb is "is" (for a singular subject "the temple"), resulting in "is visited." The adverbial phrase "once a month" can be placed at the beginning of the sentence for emphasis or at the end.

Step-by-Step Solution:

Step 1: Identify object of the active sentence: "the temple". This will become the subject in the passive sentence. Step 2: Decide on the correct auxiliary form. The verb "visit" in the active sentence is in simple present. For a singular subject "the temple," the passive form becomes "is visited". Step 3: Add the agent "by us" to show who performs the action, though it is optional in many real-world sentences. Step 4: Position the frequency phrase "once a month" at the beginning of the sentence for emphasis: "Once a month the temple is visited by us."

Verification / Alternative check:
Reading the passive sentence "Once a month the temple is visited by us" confirms that the meaning remains the same as the original: the action of visiting the temple happens monthly and is performed by us. The grammar is correct: singular subject "the temple," auxiliary "is," and past participle "visited." The frequency phrase is correctly placed and clearly modifies the entire action.

Why Other Options Are Wrong:

Option B: "Visiting the temple is done by us once a month." is grammatically possible but awkward and wordy; exam questions usually prefer the cleaner "is visited" structure. Option C: "We ourselves visited the temple once a month." remains in active voice and also mixes simple past with a frequency phrase that suggests a habit. Option D: "Monthly there is a visit by us to the temple." is unnatural and uses a heavy nominalisation ("a visit") that exam boards typically avoid. Option E: "We visit the temple once a month regularly." is active voice and also redundant, since "once a month" already implies regularity.

Common Pitfalls:
Candidates sometimes believe they must always use highly complex structures like "is done by" to show passive voice, which leads to awkward sentences. Another mistake is shifting the tense incorrectly, for example turning simple present into simple past while making the transformation. A good rule of thumb is to first identify the tense in the active sentence, then keep the same tense in the passive form, adjusting only for subject number and placing adverbials logically.

Final Answer:
The correct passive voice sentence is Once a month the temple is visited by us.