Choose the sentence that is in 'Active construction':

The correct answer is Option (1) → Why did Sheela jump over the wall?

Active and passive construction:

• In the active voice the subject does the action.
• In the passive voice the subject receives the action:
  • the verb is be + past participle (was seen, was built);
  • the doer comes with by, or is left out.
• This sentence: Sheela herself does the jumping, and the verb "did jump" has no be + past participle, so it is an active question.
  Example: Who broke the window?

Why the Other Options are Incorrect?

Option 2: The mouse was first seen by Kaustav. — Incorrect. "Was seen" is be + past participle, and the doer comes with "by Kaustav": passive.

Option 3: A new shopping complex was built. — Incorrect. "Was built" is passive; the doer is left out.

Option 4: Look! the page was torn by Sudip. — Incorrect. "Was torn by Sudip" is passive; "Look!" in front does not change the voice of the main sentence.

Contrast: active, the subject does the action (Sheela did jump); passive, the subject receives it, be + past participle (was seen, was built, was torn).