Which of the following statements would be said with a serious tone?

a. "Oops, sorry I dropped your book."

C. "Would you like to come to my house to study?"

b. "My uncle died trying to save lives in the war." d. "I just got a new puppy."

B

Explanation:

A: " "Oops, sorry I dropped your book."

In this statement, someone is apologizing. It would use a friendly or apologetic tone.

B: "My uncle died trying to save lives in the war."

In this statement, someone is stating they lost a family member during a war. This would be said with a serious tone, because it deals with loss.

C: "Would you like to come to my house to study?"

In this statement, someone is asking another person to study with them. This would have a friendly tone.

D. "I just got a new puppy."

In this statement, someone is saying they got a new pet. This would use a happy or excited tone.

Therefore, the correct answer is B: "My uncle died trying to save lives in the war."