Which part of speech is the underlined word?

i'm using a ruler to draw a straight line. (straight being the underlined word)

a.
interjection

b.
adverb

c.
adjective

d.
pronoun

Read the sample student claim. if university education was made free for everyone, i would be thrilled because more people would go to college and pursue successful careers. why is this not an effective claim? check all that apply. it is a topic with two or more viewpoints. it does not contain the writer’s opinion. it is simply a personal preference or feeling. it does not present supporting evidence. it cannot be supported with logical reasons.