Final answer:
The correct answer is c. No, because it would increase the burden on Sally to pay Felipe instead of Matteo.
Step-by-step explanation:
In this case, Sally and Matteo entered into a contract where Matteo agreed to paint a picture of a ship in exchange for $100 from Sally. However, Matteo assigned the right to collect payment to Felipe instead of collecting it directly from Sally. This assignment is not legally valid because it increases the burden on Sally to pay Felipe instead of the original party, Matteo.
Assignments of rights in contracts are generally valid, but in this case, the assignment significantly changes the original terms of the contract and puts an additional burden on Sally. Therefore, the assignment is not legally valid.