B.
A terrible head wound he suffered in battle.
It means that people look at the problem instead of the whole situtation as a whole.
Answer:
b) heavy rains or fast-melting snow causes floods in many parts of the world.
Explanation:
"fast-melting snow" which is closer to "causes" is singular
(if there aren't any options) it really just depends on your opinion, but to me it would have to be 1st person. it can also can be considered the most explanatory, but again that's only my opinion.
hope this is helpful!