really stuck on this question idrk why.. can anyone help me?

Answer:
i think its C) 3x^2 + 5
Step-by-step explanation:
because it matches it matched the rectangle, I'm so sorry if this is wrong I tried my best good luck!!
Answer:
3x^2 + 15x
Step-by-step explanation:
area = length x width
a = 3x(x + 5)
a = 3x^2 + 15x