Charle's Law states that volume and temperature have an inverse relationship.
V/T = k
where k is some constant
We can use this to solve our question
V₁/T₁ = k = V₂/T₂
V₁/T₁ = V₂/T₂
1000 mL = 1 L
1L/500K = V₂/250K
V₂ = 0.5 L = 500 mL
The correct answer is C. 500 mL