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

Q:

During his long discourse, he did not touch the central idea of the topic. 

• 1
  touch on
• 2
  touch upon
• 3
  touch
• 4
  No improvement