I think the answer you're looking for in theory but I could be not understanding the question well enough.
The answer is B. Precipitin Test.
B storing eggs , I think that’s the answer
Answer:
The battery is the set of vertical lines at the bottom, so there's one battery.
The switches are the line between the small circles (they're closed here) there are 2 of them.
The circles with Xs inside are bulbs.
So B is correct.
