Which of the following situations gives an example of breach of contract by inadvertence?

A breach of contract occurs when a party fails to perform a contractual obligation. NPPE materials often distinguish types of breach by intent or cause: inadvertent breach is an unintentional failure to meet a promise (e.g., oversight, mistake in execution), as opposed to deliberate breach (sometimes called efficient breach) where a party knowingly chooses not to perform, or incapacity-related non-performance where the party cannot perform due to insufficient resources or capability. Option B directly describes inadvertence: unintentionally failing to carry out a specified promise or obligation. Option C describes a deliberate decision not to perform (a willful breach). Option D reflects inability to perform due to lack of resources or expertise—more akin to incapacity or poor planning, not “inadvertence” in the narrow sense used in NPPE summaries. Option A is more about contract interpretation/ambiguity and potential dispute over meaning; it may lead to an alleged breach, but it is not the clearest example of inadvertent breach. Therefore, B is the best answer.