What is the value of (-7 + 3i) - (2 - 6i) ?

a.-9 + 9i

b.-9 - 3i

c.-5 - 3i

d.-5 + 9i

To perform subtraction of complex numbers, it is necessary to group both real terms and both imaginary terms together before simplifying. This is done as follows:

(-7 + 3i) - (2 - 6i)

(-7 + 3i) + (-2 + 6i)

Grouping similar terms:

(-7 + - 2) + (3i + 6i)

Simplifying:

-9 + 9i

From the choices, the correct answer is A.