Is the following sentence linguistically acceptable?
John asked who and where Bill had seen.
OPTIONS:
- unacceptable
- acceptable

unacceptable

Is the following sentence linguistically acceptable?
Which city and which conference did Bill go to?
OPTIONS:
- unacceptable
- acceptable

acceptable

Is the following sentence linguistically acceptable?
We are using their teaching material.
OPTIONS:
- unacceptable
- acceptable

acceptable

Is the following sentence linguistically acceptable?
My niece could write me letters before her third birthday.
OPTIONS:
- unacceptable
- acceptable
acceptable