Answer:
C. Gandhi protested against taxes.
Step-by-step explanation:
Eventhough Gandhi protested on many different things, and the main goal of the whole non-cooperation movement was to gain the independence of India from the British empire, the option that best describes the excerpt is that he protested the taxes in order to do so, when the empire saw that they couldn´t raise taxes from indians anymore, it was of no use for them and it was actually very expensive to keep them under their power.