Select the option that expresses the given sentence in active voice.
"The experiment is being completed by the whole class."

Correct option is D

Explanation of the Correct Answer: · The given sentence is in passive voice (present continuous tense).
· The active form of "is being completed" (passive) is "is completing" (active).
· The correct structure is:
· Passive: "The experiment is being completed by the whole class."
· Active: "The whole class is completing the experiment."
Why Are the Other Options Incorrect? · (a) "The whole class has completed the experiment." → Incorrect; changes the tense to present perfect.
· (b) "The whole class completes the experiment." → Incorrect; changes the tense to simple present.
· (c) "The whole class has been completing the experiment." → Incorrect; changes the tense to present perfect continuous.
Thus, the correct active voice sentence is:
"The whole class is completing the experiment."