19. Which of the following about morphemes is incorrect?
(A) Morphemes like true, mother, and orange are free morphemes.
(B) –ful, –ed, re- are bound morphemes.
(C) –ment and mis- are derivational morphemes.
(D) a- and -ed are inflectional morphemes.

Inflectional morphemes:

indicate aspects of the grammatical function of a word. There are eight inflectional morphemes in English. They are all suffixes. Two inflectional morphemes can be attached to nouns, -‘s (possessive case), -(e)s (plural). Four inflections can be attached to verbs, -(e)d (past tense), -ing (present participle), -en (past participle), -s (3rd person singular). Two inflections can be attached to adjectives, -er (comparative), -est (superlative).