When Castro suggested adding a burrito to the McDonald's menu, he needed to seek approval from the franchisor. This was likely due to which of the following?

a$.$ McDonald's executives do not trust that franchisees understand local market preferences.

b$.$ McDonald's prefers that all restaurants offer the same menu items to maintain brand consistency.

c$.$ McDonald's does not want to pay franchisees a royalty fee for developing new products.

d$.$ McDonald's executives worry that competitors will begin selling similar items at a lower cost.