Final answer:
Amongst the given sentences, the correct sentence that uses the word vague correctly is: The directions were too vague to help them find the meeting location.
Step-by-step explanation:
The correct sentence that uses the word vague correctly is: The directions were too vague to help them find the meeting location.
This sentence illustrates the correct usage of vague as it describes the directions as unclear or lacking in detail. The word vague means not clearly or precisely expressed or stated. In this context, it implies that the directions provided were not specific enough to guide the individuals to the meeting location effectively.