When the net force of opposite forces is zero, the forces are A)
not even
B)
unequal
C)
unbalanced
D)
balanced

D.) Balanced

Explanation:

if 2 forces push ir pull on an object in opposite directions, and the two forces cancel Each other exactly, the net force is zero

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.