Which statement includes an idiom? Group of answer choices

a. My heart was beating much more quickly than it ever had when someone asked me to dance.

b. I realized that he was about to spill the beans even though he'd promised to keep my secret.

c. My heart was soaring with joy when I arrived at the airport to greet my grandparents.

d. The melody kept playing over and over in my mind until finally I turned on the radio.