Which market segment criteria refers to the fact that segments must be large enough for the firm to make a profit by serving them?

Substantial

Explanation:

The market segment criteria refer to the fact that segments must be large enough for the firm to make a profit by serving them is generally known as "Substantial." In the substantial, there would be no point in dissipating the marketing budget at a market segment that is inadequately large rather has negligible spending authority. A viable market segment is habitually a homogenous group with precisely determined characters before-mentioned as socio-economic background, age group, as well as brand acumen.

a.