The underlined part in‘a reserved girl’ with the meaning ‘a quiet girl’is a: 

bases & affixes

free & bound morphemes

root & stem

segment of language with meaning

a word to which an affix is attached

mono-morphemic word

bound base

derivational suffix

derivational infix

derivational suffix

derivational infix

bound base

one

two

four

two

three

four

derivational & inflectional

bases & affixes

root & stem

root & stem

derivational & inflectional

free & bound morphemes

morpheme with principal meaning

segment of language with lexical meaning

base or root

their function

their position

their characteristics

derivational suffix

derivational infix

bound base

derivational suffix

derivational infix

bound base

inflectional suffix

derivational infix

bound base

inflectional suffix

derivational infix

bound base

derivational suffix

derivational infix

bound base