What's textual evidence supports the inference that can let was creative and determined spy check all that apply

I believe all of the statements apply except for the last one ("Prisoners could easily respond in the same way.")

All of those previous statements talk about Van Lew's creativity and determination. "Undeterred by the strict prison rules" means that nothing could discourage her from accomplishing her goals - not even the prisons. "She frequently brought books for the prisoners" means that she had found a creative way to pass messages. "She could tuck messages down a book's spine" means she went to great lengths (and great risks). "She made a pinhole ... " is another detail that illustrates her creativity.

The last statement, however, doesn't have anything to do with her. It concerns the prisoners and their means of communicating with her.