Sergei's question is a scientific question because it is based on observations and could be answered through an investigation. His question has a narrow focus, addresses a gap in his knowledge, and may lead to a hypothesis that can be tested.
Answer:
i think it d
Explanation:
a) 198
just did the usatestprep
I believe your answer is B. Sorry if I am wrong.
I hope I helped
Have an AMAZING day. :)