Question

many immigrants have to be to get into the united states. resources resourceful resourceless

Explanation:

The sentence requires an adjective to describe immigrants. "resources" is a noun, so it is eliminated. "resourceless" means lacking resources, which does not fit the context of successfully immigrating. "resourceful" means having the ability to find solutions and use available means, which logically describes immigrants navigating the process of entering the US.

Answer:

resourceful