Correct answer only !

which shows the correct reflected ray?

The answer would be:

D.

Here's why:

According to the Law of Reflection, in a smooth the angle of incidence should be equal to the angle of reflection. This means that the angle of incidence of the ray from the normal, will create a reflected ray that measures the same as ray of incidence from the normal.

It is confusing, but look that the image below to grasp the explanation.

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft