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A train engine of mass 5000 kg starts from rest and accelerates around a curve around a mountain. The train maintains a constant $0.2 \ m/s^2$ tangential acceleration throughout the curve which has a radius of 300 m.

What is the direction of the engine's acceleration vector, relative to a radius line drawn to the center of the curve, once it has completed ${20}^{\circ}$ of the curve?

A

${8}^{\circ}$

B

${12}^{\circ}$

C

${20}^{\circ}$

D

${36}^{\circ}$

E

${55}^{\circ}$

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