instruction: Is the next sentence syntactically and semantically acceptable?

I am delighted that Mary finished his thesis.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

They haven't decided which attorney will give the closing argument.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Who do you think that you saw?
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

A is similar to B.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable