a) mr.white doubts that the monkey's paw can really grant wishes.
It would be a) because Mr. White is in a way fighting with his mind.
It's more internal than the rest because:
b) is a man vs. man conflict
c) is also a man vs. man conflict
d) is a man vs. environment conflict
Hope I was able to help at least a little bit :)
Have you even read it yet?
The introduction of the plot is the exposition
