Btw there is 2 more options. number 3 is, (step3) and number 4 is, Raul did not make a mistake.

B.He did not add the corresponding parts of the complex numbers.

Step-by-step explanation:

A mid point is a point that is of equal distance to two reference points.

Given: Find the midpoint of 5+(-3)i and 12+7i.

These expressions have two parts: the value and complex number parts.

Thus the addition ought to have been;

(5+(-3i)) + (12+7i) = (5 - 3i) + (12 + 7i)

                           = (5 + 12) + (-3i + 7i)

                           = 17 + 4i

The midpoint can be determined as:

Thus it can be observed that Raul did not add the corresponding parts of the complex numbers..

answer is second equation