Answer:
1.The force applied to a spring equals the product of the spring constant and the displacement.
Step-by-step explanation:
Hooke's law states the relationship between force applied to a spring, spring constant and displacement of the spring, as follows:

where
F is the force applied
k is the spring constant (which represents the stiffness of the spring)
x is the displacement of the spring relative to its equilibrium position (compression or stretching)
From the equation above, we see that the correct answer is
1.The force applied to a spring equals the product of the spring constant and the displacement.