Answer :
A. The family took one-third of the toys to the donation center. is correct
B. one-half shouldn't be hyphened, should not be a hyphen there.
C. 0.25 should be written as one quarter or one-fourth
B. one-half shouldn't be hyphened, should not be a hyphen there.
C. 0.25 should be written as one quarter or one-fourth