C is always the answer when your in doubt
<span>The main cause for Japan's isolationism was to avert the spread of Christianity.
</span>Several Edicts were issued throughout the early years of the Tokugawa Shogunate, declaring isolation, Each edict grew more and more forceful in its condemnation <span>of Christianity.</span>
They were accused of overproducing oil. Hope this Helps! :^)
Navy, trade (second could be multiple things)
