Amor, a successful brand of women's clothing, recently introduced a line of fitness equipment. This is an example of $\_\_\_\_\_\_\_\_.$

Amor, a successful brand of women's clothing, recently introduced a line of fitness equipment. This is an example of $\_\_\_\_\_\_\_\_.$

B$)$ niche marketing

E$)$ product adaptation

D$)$ prospecting

C$)$ diversification

A$)$ mass customization