Answer:
Deciding on a course of action
Explanation:
The subject names the person or thing that is being talked about or performs an action in a particular sentence.
The predicate on the other hand, gives details about what the subject does or gives information about the subject.
In the sentence Given above ;
Deciding on a course of action was difficult for Jane.
The subject here is Jane.
The information given about the subject is about decision making, Hence, the predicate is : DECIDING ON A COURSE OF ACTION.