Which sentence uses the word selection as a direct object
a. after the selection mr. gomez receive the appointment
b. the selection of the panel was challenging with so many qualified candidates.
c. the u. should senate however must approve the president's selection
d. the selection process may take weeks

The object which follows the transitive verb is the direct object. It can be in the form of pronouns, nouns, clauses or phrases.

A formula which can be utilized to identify the direct object is

Subject + verb+ what? or who?= direct object.

Therefore, the sentence which uses the word 'selection' as a direct object is " The U.S, however, must approve the president's selection."

Wherein the direct object is "President's selection."