The number 33i is complex number. Hence option C is correct.
What is complex number?
The number that are constitute of real and imaginary numbers are called complex number.
Standard form of complex number = a + bi
Comparing the 33i with standard equation.
We have a = 0 (real part) and b = 33 (imaginary part) followed by i.
Thus, the number 33i is complex number.
Learn more about complex number here:
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