When spotting an overhead press, the spotter would need to
a.
keep his or her hands off the lifter and weights and make sure the lifter did not fall back
b.
keep his or her hands beneath the bar and watch the bar carefully
c.
hold the lifter under his or her shoulders and move with the lifter as the weight is lifted
d.
place his or her hands outside the lifter's hands and stand with a straight back

B.keep his or her hands beneath the bar and watch the bar carefully

Explanation:

When spotting an overhead press, that is when a person is helping someone when doing overhead press, because if the person doing it can get tired, or can have an accident and he is there to keep the person from injure himself when doing it and to catch the overhead press in case that it slips from the hands of the lifter, so the spotter has to keep his hand beneath the bar and watch it hcarefully to better help the lifter if the gets tired or the press slips from his hands.