Which of the following statements describes breach of contract?

In Canadian contract law, a contract is a legally binding agreement between two or more parties that creates enforceable obligations. A "breach of contract" occurs when one of the parties simply fails to complete the obligations, duties, or deliverables explicitly agreed upon in that contract, without a valid legal excuse. This could manifest as failing to deliver a project on the agreed-upon deadline, failing to pay for services rendered, or delivering work that does not meet the technical specifications outlined in the agreement. It is a strict matter of failing to do what was promised. This is distinct from Option D ("a failure to exercise due care"), which describes the legal concept of negligence under tort law. A professional can be sued for breach of contract if they don't deliver what they promised, or sued for negligence (tort) if they perform their duties carelessly and cause harm, even if a formal contract didn't exist.