Which number below best represents a depth of two meters below the ground?
A. -2
B. 20
C. 2
D. -20

Answer:
-2
Step-by-step explanation:
We usually start measuring the height from the ground, so basically the positive direction is above the ground, for example 2 is the best number which represents 2m above the ground.
So the negative sign represents the depth below the ground.