Select the option that expresses the given sentence in active voice.
The data was not analysed by the researchers carefully.

Correct option is A

The correct expression in active voice is (a) "The researchers did not analyse the data carefully."
· Active Voice- Active voice is a grammatical structure in which the subject of the sentence performs the action expressed by the verb.
· Passive Voice- Passive voice refers to a grammatical construction where the subject of a sentence undergoes an action rather than performing it. In passive voice sentences, the emphasis is on the recipient or object of the action.
Conversion rule:
Past indefinite
Subject + did not V1 + object. -> <- Object + auxiliary verb (was, were) not + past participle + by + subject.