What is the part of speech of the word in the sentence in parenthesis ?

there were no gas stations (for) several miles along the highway.

a.
adjective

b.
conjunction

c.
adverb

d.
preposition

2. what is the part of speech of the underlined word in the sentence?

(they) were invited to the picnic on saturday.

a.
pronoun

b.
interjection

c.
noun

d.
adjective

3. what is the part of speech of the underlined word in the sentence?

do you want to go to the art ( museum ) ?

a.
noun

b.
adverb

c.
conjunction

d