Multi-choice problem: Continue writing the next sentence in this paragraph:

How to gauge distance
Stand in front of the object or target.
Hold your arm out directly in front of you and point your thumb upward. Your thumb is going to act as a marker.

pick from the following.
(a). Check the distance between your pointer and middle finger with your watch. Focus only your eyes on the object that you think will move to confirm the distance.;
(b). Look between your fingers to see how close and far apart they are. This is your opportunity to gain or lose your bearings.;
(c). Hold your arm as close to the target as possible. Compare the distance between your thumb and forefinger.;
(d). It will help you gauge the distance between you and the object. Close one eye and align your thumb with the object.;
(d).