I require help with this question please, thank you.

Suppose the following table shows the production possibilities for an economy.

Production Point Good X Good Y

A 8 5

B 5 10

U 5 5

a.For good Y, what is the opportunity cost of moving from point A to point B?

b.For good X, what is the opportunity cost of moving from point B to point A?

c.For good X, what is the opportunity cost of moving from point U to point A?

d. Suppose points A and B are on the production possibility frontier. What conclusion can be drawn about production point U?