Answer:
A. do not offer the promise of sustainable competitive advantage.
Step-by-step explanation:
Easy-to-copy differentiating features refers to those features of an organization that typically differentiates them from their rivals in the same industry but are however, easy to be copied by another firm. Thus, it cannot produce a sustainable competitive advantage over the competitors of a business firm or company.
This ultimately implies that, easy-to-copy differentiating features do not offer the promise of sustainable competitive advantage because the end users (buyers) wouldn't find any difference between the company's product and the rival company that copied it.