The answer is A. The Emperor Qian Long wrote this letter in response to king George' proposals. By mentioning that the <em>king's embassador may have</em> <em>presented them in a thoughtless manner, and the king's lack of knowledge of the dynasty regulations could break them</em>, the Emperor shows no intention in giving the king's requests.
The correct answer is B, -ous.
This is because -ous is used in building adjectives like meticulous, glorious, courageous, whereas -tion is used in making nouns. -ly is used in making adverbs, and -ate is used in making verbs.