Can someone help me with these 3 thank you

Which sentence about subject-verb agreement is not true? a. singular subjects go with singular verbs. b. plural subjects go with plural verbs. c. when the subject and the verb go together, they agree. d. plural verbs go with singular subjects.

Brendan is playing in the backyard.

Amanda bought a prom dress which she considered the most beautiful dress ever made. adjective clause: word(s) modified: