[QA] I know you feel bad now,Tommy but try to put it out of your mind. By the time you’re an adult, you___all about it

Question:

I know you feel bad now, Tommy, but try to put it out of your mind. By the time you’re an adult, you___all about it.

• A.
  are forgetting
• B.
  will have forgotten
• C.
  forget 
• D.
  will be forgetting