Explain why knowing additional information about the hydrofluoric acid and other substances might be helpful in solving this crime.

a lot

explanation:

it provides a unique and personal perspective on a significant historical event.

the answer is c. it calls attention to the urgency of the message

let's think

what are some attributes about yourself that has changed?

have you had goals that you've been trying to reach, goals you've thrown away?

how do you view your character; what or who has changed it?

what stories do you have about people or things that have changed you?

has religion changed you? an exciting event?

do you believe life has an adventure in store? do you believe it's meaningless?

try to answer questions about yourself.