[QA] Seeing the children playing hide and seek in the school yard,_________.

Question:

Seeing the children playing hide and seek in the school yard,_________.

• A.
  I thought of the times long ago when I did the same thing
• B.
  one of the children hid behind a huge tree
• C.
  it had a lot of fun
• D.
  my friends called me to pick them up at the bus stop