Q$3-$

A$-$

Qualitative forecasting methods are subjective. It is based on information that can't be measured.

B$-$

It is appropriate when there is no past data and when subjective factors are important.

C$-$

The $4$ methods used in qualitative forecasting are;

$1.$ Expert opinion approach

$2.$ Delphi method

$3.$ Historical life$-$cycle analogy

$4.$ Market research approach.

D$-$

Yes, the naive model is a qualitative method.