Brand loyalty indicates customer’s ‐ towards the brand.

A B C D ;)

It means that customers are loyal toward a brand, and thus committed toward it.

It's commitment towards particular brand

All

As Brand loyalty occurs when a customer chooses to repeatedly purchase a product produced by the same company instead of a substitute product produced by a competitor

Then A,B,C & D are correct 

(a)Commitment

I would add also : 

The company's reputation

Loyalty comes with commitment which is purely based on Quality,Attributes,repeated usage and thus love and belief on the specific brand.

I think customer loyality is close to commitment but its far more than commitment

customer's belief and confidence

B