Which is likely an important reason for the relatively benign rivalry between Coke and Pepsi?

Question $13$ options:

a$)$

Both firms have been launching new product categories and entering new markets.

b$)$

Both firms have been acquiring many of their bottling partners.

c$)$

Pepsi sometimes claims that Coke's products are inferior to$,$ or copies of$,$ its own products.

d$)$

Demand for carbonated drinks has been slowing down since the early $2000$s$.$