We were exhausted . . . . . . . . the end of the journey. A. in B. by C. about D. of

The correct answer is: D. of

The preposition “of” is used to indicate the end of a period of time or a series of events. In this case, the sentence is about the end of a journey, so the preposition “of” is the most logical choice.

The other options are not as appropriate in this context. The preposition “in” is used to indicate a location or position within something. The preposition “by” is used to indicate a means or method of doing something. The preposition “about” is used to indicate a topic or subject of discussion.

Here are some examples of how the preposition “of” is used to indicate the end of a period of time or a series of events:

• We were exhausted at the end of the journey.
• The meeting was over at 5:00 pm.
• The party ended at
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  midnight.
• The game was over in two hours.

I hope this helps! Let me know if you have any other questions.