Question

The Trojan horse, another software trick, involves Eve designing a program that appears to act like a genuine encryption product, but which actually betrays the user.

What part of speech is the underlined word?

noun
verb
adverb
adjective

Answer 1

Adverb.

Explanation: "actually" modifies the verb "betrays" (it tells how/to what extent the betraying happens), and words that modify verbs are adverbs.