Dave grows wheat \((w)\) and barley \((b)\) on a farm. Dave expects to profit \(\$ 150\) per acre for wheat and \(\$ 180\) per acre for barley. The cost of seed is \(\$ 10\) per acre for wheat and \(\$ 15\) per acre for barley. Dave can only afford to spend \(\$ 945\) on seed. What is the constraint inequality in this situation?

a. \(w+b \leq 945\)

b. \(10 w+15 b \geq 945\)

c. \(10 w+15 b \leq 945\)

d. \(150 w+180 w \leq 945\)