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
And what’s your question?
Answer:
c) must
Explanation:
Abeba always get prizes from her school. She <u><em>must </em></u>study hard.
a) might
b) may
c) must
D sounds a little logical... But it sounds illogical too.... So, try C?
