instruction: Is the next sentence syntactically and semantically acceptable?

This hat I know the boy who was wearing.
OPTIONS:
- unacceptable
- acceptable

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

She was always clad in black.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

That the defendant had been rude was stoutly denied by his lawyer.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Mary has more friends than just Bill and Pete.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable