During his stay in Lilipute Gulliver shows himself greatly enamored by that people and decides to help the people in the way he can, and one of his greatest achievements is that he wins the war against Blefuscu, Lilipute's greatest enemy.
Also Gulliver:
Do not attack the Lilliputians
is kind and polite
After his release from the ropes and moorings, he prostrated himself to the ground and kissed the hands of the King
When he walks he carefully observes the ground so as not to step on the inhabitants.
C) Celebrate. This would make better sense, since it isn't having a claim to recognize something when it already is a holiday. Observing something would simply be to inspect. Mark is definitely not your answer and you should know that the last ones available aren't reasonable! So the answer is C)