Concept: The verb "prefer" has a specific preposition that is used when comparing two things.
Step 1: Understanding the usage of "prefer"
When expressing a preference for one thing over another, the verb "prefer" is followed by the object of preference, then the preposition "to", and then the other item being compared.
The structure is: prefer (something) to (something else).
Step 2: Applying the rule to the sentence
In the sentence "I prefer milk \ldots\ldots\ldots\ldots\ldots Coffee," milk is the preferred item, and coffee is the item it is being preferred over.
According to the rule, the correct preposition to use is "to".
So, the sentence becomes: "I prefer milk to Coffee."
Step 3: Evaluating the options
(1) to: Correct. This is the standard preposition used with "prefer" for comparisons.
(2) than: "Than" is used with comparative adjectives (e.g., "better than," "taller than") but not typically directly with the verb "prefer" in this structure. While one might say "I like milk more than coffee," with "prefer," "to" is standard.
(3) of: Incorrect preposition in this context.
(4) for: Incorrect preposition in this context.