PLEASE HELP I WILL MARK BRAINLIEST

Answer: Um... I'm confused You already chose the answer? what exactly do you need help with?
Step-by-step explanation:
Answer:
(a) 3/8
Step-by-step explanation:
The diagram shows the 8 ways Sarah could have brothers and sisters. Of those, there are 3 that give her two brothers and one sister:
BBS, BSB, SBB
The probability that Sarah has exactly two brothers among her three siblings is ...
3/8