Question

Which of the following was a pull factor that caused the dutch to explore the west indies? Here are the choices they give me
a. the desire to profit from the trade of pepper and other spices found in the west indies
b. the desire to increase the size of the dutch population in Europe
c. the need to find an alternate source of food following a great famine in Europe
d. the need to protect Dutch military outposts in west Africa

Please help and explain the lesson didn't mention this. You don't have to but just to know why.