Which expression has a value of 1?

A.

4 : 4 + 4 - 4

B.

4 · 4 - 4 : 4

C.

4 - 4 : 4 - 4

D.

4 : 4 + 4 + 4

I am adding the brackets to show in which order the expressions will be evaluated:

A.

(4 : 4) + 4 - 4 = 1+4-4 = 1 (the correct answer)

B.

(4 · 4) - (4 : 4) = 16-1 = 15

C.

4 - (4 : 4) - 4 = 4-1-4 = - 1

D.

(4 : 4) + 4 + 4 = 1+4+4 = 9

A is the answer because 4 divided by 4 plus 4 minus 4 = 1