Read the two sentences.
I listened to the birds singing. I read a book on the patio.
Which sentence combines the two sentences using a present participle?
a. I listened to the birds singing, and I read a book on the patio.
b. While I listened to the birds singing, I read a book on the patio.
c. Listening to the birds singing, I read a book on the patio.
d. I read a book on the patio while I listened to the birds singing.