The number √-1 is called:A.Real numberB.Natural NumberC.Complex NumberD.Rational Numbe

To answer the question, we need to understand the different types of numbers mentioned.

A. Real numbers: These are numbers that can be represented on the number line. They include both rational and irrational numbers. Examples of real numbers are 3, -2.5, and √2.

B. Natural numbers: These are positive whole numbers starting from 1. Examples of natural numbers are 1, 2, 3, and so on.

C. Complex numbers: These are numbers that can be expressed in the form a + bi, where a and b are real numbers and i is the imaginary unit (√-1). Complex numbers include both real and imaginary parts. Examples of complex numbers are 2 + 3i, -1 + 4i, and √-1.

D. Rational numbers: These are numbers that can be expressed as a fraction of two integers. Examples of rational numbers are 1/2, -3/4, and 0.75.

Based on the given options, the correct answer is C. Complex Number, as √-1 is an example of an imaginary number and falls under the category of complex numbers.