I got these two wrong and am wondering what the correct answers are? I have bolded and italized my answers. Can you show me where I went wrong.

1. Which of the following polynomials can be factored as a difference of two squares?

A) 16x2 + 1

B) 9y2 - 1

C) x2 + 4x + 4

D) 144a2 + 16

E) all of the above

2. Factor 4x2 - 20x + 25. Select the answer.

A) 2x-5

B) (2x-5)2

C) (2x+5)2

D) 2x+5

E) none of these