Question

A complex number with no imaginary part is a _____ number .

• A. real
  
• B. imaginary
  
• C. rational
  
• D. irrational

Answer 1

The correct option is A real


For the complex number $a+ib$, put
$b=0$

Now, the complex number equals $a$.
Since $a$ is a real number (by the very definition of complex number), the complex number formed with no imaginary part is also a real number.