Answer:
B.A submarine was 250 meters below sea level...
Step-by-step explanation:
I. Given went down is negative.value, and went up is positive value
He went down for 250, in one hr, he went up 200 and 50 meters
= -250 + 200 + 5
= -250 + 250
= 0
That means he's already beyond the surface.
Hope that help :)