First you evaluate what is in the parenthesis, which is 2+2 = 4. After doing that we're at:
8 / 2 * 4 =
Next, we do multiplication and division. If there are more than one such operation, we go from the left first, which is division. So we evaluate 8/2 = 4 next. After that, we're at:
4 * 4 = 16
I've seen this asked on Facebook where 1 was incorrectly the most frequent answer. I blame the PEMDAS (Please Excuse My Dear Aunt Sally) rule. That incorrectly suggests the order of operations is: parenthesis, exponents, division, multiplication, division, addition, subtraction.
The actual order puts division and multiplication equally as well as addition and subtraction equally. When you see two operations in the same equations of equal priority, go from left to right.