The force due to gravity acting on an object (in this case, each wrestler) can be calculated using the formula:
\[ F = m \cdot g \]
where \( F \) is the force, \( m \) is the mass (weight in pounds), and \( g \) is the acceleration due to gravity. Since \( g \) is a constant, we can compare the forces directly based on their weights alone.
Given the weights:
- Wrestler A: 170 pounds
- Wrestler B: 168 pounds
- Wrestler C: 171 pounds
- Wrestler D: 169 pounds
Wrestler C, who weighs 171 pounds, experiences the greatest force due to gravity.
So, the answer is:
Wrestler C