What is a common feature of a contract of adhesion?

A contract of adhesion is characterized by standardized terms that are prepared by one party, typically without the opportunity for the other party to negotiate those terms. This type of contract often arises in situations where one party has considerably more power or expertise, such as insurance companies creating policies that consumers must accept as-is.

The nature of a contract of adhesion means that the weaker party has little to no ability to influence the terms, leading to a "take it or leave it" scenario. This is why option B is the correct choice, as it highlights the lack of negotiation involved in these agreements.

In contrast, the other options reflect scenarios that would actually undermine the essence of a contract of adhesion. For instance, mutual negotiation of terms implies that both parties have equal input and bargaining power, which does not fit the definition of a contract of adhesion. Similarly, open terms for discussion would suggest a dialogue and potential modifications, which contradicts the standardized nature of adhesion contracts. Therefore, the key feature here is the one-sided preparation of terms by one party, making option B the accurate representation of what defines a contract of adhesion.