The imaginary numbers are a subset of the complex numbers. Complex numbers are numbers that can be written in the form a + bi, where a and b are real numbers and i is the imaginary unit (defined as the square root of -1). The set of complex numbers includes both real numbers (where b = 0) and imaginary numbers (where a = 0). Therefore, since imaginary numbers are a part of the complex numbers, the correct answer is complex.
