Answer:
a. "My friends are lazy"
b. "Mis amigos son perezosas"
Step-by-step explanation:
Both sentences need to be changed because both language use different terms to imply that there are multiple people. Unlike English, Spanish is an entirely gendered language so it (often) uses different endings for adjectives, unlike English. If a friend group is entirely comprised of women, it will use nouns and adjectives that end in "a" rather than "o".