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:

My group of tenth-graders are such well behaved.

• 1
  is so well behaved
• 2
  are so well behaved
• 3
  is such well behaved
• 4
  No improvement