The correct answer is: B. did not have enough.
The other options are:
A. exhausted my stock of: This means to use up all of something. In this case, it would mean that the person used up all of their money. However, the question is about running out of money, not using it up.
C. lost: This means to no longer have something because it has been misplaced or stolen. In this case, it would mean that the person lost their money. However, the question is about running out of money, not losing it.
D. carried a lot: This means to have a lot of something with you. In this case, it would mean that the person had a lot of money with them. However, the question is about running out of money, not carrying a lot of it.
The person in the question ran out of money on their European tour. This means that they did not have enough money to cover their expenses. They may have spent more money than they anticipated, or they may have had unexpected expenses. Whatever the reason, they ended up without enough money to continue their trip.