Choice A is the correct answer. Check vertices.

1. Vertices: $(0,0), (5,0), (0,5)$.
2. Evaluate P:

• $(0,0): 0$
• $(5,0): 3(5) + 0 = 15$
• $(0,5): 0 + 2(5) = 10$

3. Max: 15.

💡 Strategic Tip: The maximum usually occurs at a vertex.

Choice B is incorrect.Choice C is incorrect.Choice D is incorrect.