Justin decides to lease the personal vehicle of his friend Simon, who owns a window...

Comprehensive and Detailed In-Depth Explanation: This scenario involves a barter arrangement where Justin leases Simon’s vehicle in exchange for renovations, requiring classification under Quebec’s Civil Code contract principles (Articles 1378–1424). A “contract by mutual agreement” (or consensual contract) is formed through the mutual consent of both parties, as Justin and Simon negotiate terms directly (Article 1385). It is “synallagmatic” because both parties have reciprocal obligations—Justin provides renovations, and Simon provides the vehicle (Article 1381). It is“onerous” since each party incurs a cost and receives a benefit, distinguishing it from a gratuitous contract (Article 1380). Finally, it is “commutative” because the value of the renovations and vehicle use is presumed equivalent at the outset, with no uncertainty as in aleatory contracts (Article 1382). Option A is incorrect because a “contract of adhesion” involves pre-set terms with no negotiation, and this is not gratuitous. Option C fails as it is not unilateral (only one party obligated) or a consumer contract (a commercial or standard-form transaction). Option D’s “instantaneous performance” is incorrect, as the lease and renovations suggest ongoing obligations. The Ethics and Professional Practice manual underscores advisors’ duty to accurately interpret contract types for clients.