Respuesta :
The answer is B because when you are at a grave you are serious there is only crying but no laughing, so you can assume that grave means b.
Answer:
B.In a serious manner
Explanation:
In the excerp when it says with a grave face and a determined mind, she walked into the meeting to deliver the bad news, in the context of the sentece the word grave means Serious manner, the word grave is often used to express serious manners or solemn, it is often used to express when someone is trying to say something really serious.