Answer: option c.
Explanation:
To find AB you can use the Pythagorean Theorem:

Where "c" is the hypotenuse and "a" and "b" are the legs of the triangle.
In this case:

Substituting values and solving for AB, we get:

To find ∠B you can use the Arctangent. Then, this is:

Since the sum of the interior angles of a triangle is 180 degrees, we know that the ∠A is:
