Answer:
The doctors alone must have gone Dutch treat, not to mention the hotel bill and all the food they brought her.
The idiomatic expression which best completes the above passage is:
A. gone Dutch treat
Explanation:
Gone Dutch treat is the idiomatic expressions which mean that each individual who is taking part in a paid activity is liable for their own expenses. It doesn't imply that a person bearing the expenses of the whole group. In the above sentences, there are a group of doctors who paid the bill by splitting it.
