Jillian simplified the expression 7+3⋅(10−6)2 in the following way:

7+3⋅(10−6)2
7+3⋅(4)2
7+3⋅16
10⋅16
160
What was the error?
A. There is no error, Jillian simplified correctly
B. Jillian should have added 7 + 3 in line 2 before doing (10−6)2
C. In line 3, Jillian should have multiplied 3⋅16 instead of adding 7 + 3
D. Jillian incorrectly simplified line 2 and it should have been 3⋅(4)2 =122