Question

the primary purpose of using the subsidiary motion to amend is to
omodify the wording of a pending motion.
ocall for an immediate vote on the original main motion.
oeliminate the main purpose of the motion.
olengthen the debate time on the main motion.

Explanation:

A subsidiary motion to Amend is used to change the wording of a pending motion to improve or alter it. It doesn't call for an immediate vote, eliminate a motion's main purpose, or lengthen debate time in its primary function.

Answer:

modify the wording of a pending motion.