A part of sentence is bold. Below are given alternatives to the bold part at (A), (B) and (C) which may improve the sentence. Choose the correct alternatives. In case no improvement is needed your answer is (D).

Q:

At an early age, he had made his mark as a teacher.

• 1
  made his mark
• 2
  makes his mark
• 3
  made his markings
• 4
  No improvement