The Overall Structure of Long Bones Gives an Optimal Strength-To-Weight

The overall structure of long bones gives an optimal strength-to-weight ratio. How is this achieved?

A) The cancellous component helps to prevent the cortical component from cracking while the cortical component helps prevent the cancellous one from yielding.
B) The cortical component helps to prevent the cancellous component from cracking while the cancellous component helps prevent the cortical one from yielding.
C) The trabeculae are more densely packed in those parts of the bone that have to transmit the greatest stress.
D) The orientation of the trabeculae corresponds to the direction of tensile and compressive stresses and is roughly orthogonal.