The plural inflectional morpheme ending is added to 1)adjective, 2)adverbs, 3)nouns, 4)verbs, 5)none

3) nouns

Explanation:

Morphemes are the smallest linguistic unit within a word that has meaning, and inflectional morphemes or suffixes refer to those morphemes added at the end of a word that completes the whole meaning of the word.

In English, plural inflectional morpheme endings can only be added to nouns since are the nouns the only part of speech that can change from singular to plural by adding a suffix. For example, car - cars, tea - teas, microscope - microscopes, glass - glasses.

if the italicized noun phrase is "the chairman", the correct option is s (subject). this noun phrase performs the syntactic function of subject of the main clause, as it preceeds the verb phrase ("heard") and is the doer of the action.

if the italicized noun phrase is "what was said about the program", the correct option is do (direct object). this noun phrase follows a transitive verb ("heard"), which requires a direct object to fully complete its meaning.

if the italicized noun phrase is "the program". the correct option is op (object of preposition). this noun phrase follows a preposition ("about"), which requires a prepositional object in order to complete its meaning.

im thinking c

sorry if its wrong : //