B.) confident
It makes the most sense
He can use a certain type of instrument or certain type of academic subject to narrow down the focus of his research.
It's the last one. we know this because it talks about how even with the smart hands of a scientist, the plan is not completely foolproof, or safe
Answer:
I think I saw a sparrow, and a robin outside in the tree. is the correct answer.
Explanation:
Sorry if I got it wrong
