Choose the correct option to complete the given sentence with an Adve…

The correct answer is Option (3) → whenever

Note: The given answer is as per the official NTA Answer Key. However, more than one answer is possible here: Option (3) "whenever" and Option (4) "when" both make a correct sentence, as explained below.

Option 1: wherever — Incorrect.

• Wherever introduces an adverb clause of place: in any place where.
• The sentence is about the time of the doctor's coming, not the place.
  Example: My dog follows me wherever I go.

Option 2: as — Incorrect.

• As in a time clause means while, at the same moment as another action.
• "Comes as he is sent for" does not give the sense of "each time he is called".
  Example: The phone rang as I was leaving.

Option 3: whenever — Correct (Answer as per NTA).

• Whenever introduces an adverb clause of time meaning every time that.
• "The doctor always comes whenever he is sent for" says that he comes on every occasion he is called.
  Example: Whenever it rains, the road gets flooded.

Complete sentence: The doctor always comes whenever he is sent for.

Option 4: when — Can also be considered as correct.

• When also introduces an adverb clause of time.
• With always in the main clause it gives the same sense of every occasion: "The doctor always comes when he is sent for" is equally correct.
  Example: She always smiles when she sees me.