The net force on the crate can be calculated using the formula Fnet = μmgcosθ, where μ is the coefficient of kinetic friction, m is the mass of the crate, g is the acceleration due to gravity, and θ is the angle between the force applied and the horizontal. In this case, μ = 0.5, m = 200 kg, g = 9.8 m/s2, and θ = 30°. Therefore, the net force on the crate is Fnet = (0.5)(200)(9.8)(cos30°) = 110 N. Therefore, the correct answer is B. 110 N.