ANSWER
The correct answer is B.
EXPLANATION
A complex number is of the form:
[tex]z = a + bi[/tex]
The second option is a complex number because it can be rewritten in the form
[tex]a + bi[/tex]
[tex] \frac{8}{3} + \sqrt{ \frac{ - 7}{3} } [/tex]
This is the same as;
[tex]\frac{8}{3} + \sqrt{ \frac{ 7}{3} } \times \sqrt{ - 1} [/tex]
Recall that
[tex] \sqrt{ - 1} = i[/tex]
Hence
[tex]\frac{8}{3} + \sqrt{ \frac{ - 7}{3} } = \frac{8}{3} + \sqrt{ \frac{ 7}{3} } i[/tex]
The correct answer is B
