Which sentences show the correct use of a semicolon with a conjunctive adverb? Select all that apply.
a. I downloaded that song yesterday, so I can play it today for my friends.
b. Our garden hose sprang a leak on Friday; therefore, Dad bought a new one over the weekend.
c. Our new neighbor came by yesterday; we were out so we didn't get to talk to him.
d. I gave up on playing the trombone, instead, I am trying out the flute.