Question

Luis, __________ bueno con tus hermanos, por favor. Eres el mayor.
A.

haz

B.

sé

C.

ve

D.

pon

Answer 1

Those are all command words.

"Haz" means "do."
Like..."Haz la tarea." --- "Do the homework."

"Se" means "be."

"Ve" means "go."

"Pon" means "put."

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If you can translate the rest of the sentence, you'll probably know which word fits best.

Answer 2

It's B

Answer 3

haz