Assuming the underlined word is 'singing,' the correct answer is going to be A. participle.
A participle and a gerund look the same - they both end in -ing. However, participles are used as adjectives (as is the case here), whereas gerunds are used as nouns. Infinitives always have the same form, which is TO + verb.
1) They could've tried to defend the European Explorers to not set foot on there land, even though they might've all died in war.
2) Horrible, they got there first, its theirs, and they don't deserve the diseases the Europeans do, they can stay to their religion, and its not a big deal.
They believed that the Constitution was a "strict" document that clearly limited the powers of the federal government. Unlike the opposition Federalist Party, the Democratic-Republican Party contended that government did not have the right to adopt additional powers to fulfill its duties under the Constitution.
The Navigation Acts (1651, 1660) were acts of Parliament intended to promote the self-sufficiency of the British Empire by restricting colonial trade to England and decreasing dependence on foreign imported goods.