This is an example of trying not to be sexist, but making the sentence less clear. I would have written it as "Members of the organization each made their own reservation." Reservation being single to match the "each" here.
If you are doing this as homework for ESL class, as a native speaker I would say the two changes would be: "Each member of the organization made his or her own
Thanks to both "keepsmiling" and "Seatleguy". The information you both provided was very helpful. BTW, for future reference I was doing this for homework.
P.S. If I want to ask another question (same topic), should I add it to this thread or create a new one?
Yet consider it's not impossibe that each person had to make more than one reservation. eg Perhaps they were all travellig to two different places, perhaps for a meeting in New York followed by one in Chicago.
You have to be careful when you call something 'a mistake'.
There was, however, a spelling mistake - resevations.
I guess we could all (each!) agree that this may not have been the best choice of a question for students. If your question is related to this same example, use this thread; if it is a different item, start a new one.