Answer: Option D
The most appropriate preposition to use in the given sentence is "with."
Explanation:
A preposition is a word that links a noun, pronoun, or noun phrase to some other part of the sentence. It shows the relationship between the noun and the other words in the sentence. In this sentence, we need a preposition to link "obsessed" with "such ideas as you are."
Let's examine each option to see which one works best:
A. "In" is incorrect because it doesn't accurately convey the relationship between "obsessed" and "such ideas." "In" is used to indicate location or position, and it doesn't fit in this context.
B. "On" is also incorrect because it doesn't accurately convey the relationship between "obsessed" and "such ideas." "On" is used to indicate a surface or a topic, but it doesn't fit in this context.
C. "For" is incorrect because it doesn't accurately convey the relationship between "obsessed" and "such ideas." "For" is used to indicate purpose, but it doesn't fit in this context.
D. "With" is the correct preposition to use because it accurately conveys the relationship between "obsessed" and "such ideas." "With" is used to indicate association or attachment, and it fits perfectly in this context. The speaker is not attached to or associated with the ideas in the same way as the listener.
E. "None of these" is not the correct answer since option D, "with," is the correct preposition to use in this context.
In conclusion, the correct preposition to use in the given sentence is "with." The sentence should read: "I am not obsessed with such ideas as you are."