There should be a comma and a space before each item in the list. For example; "I have six apples, fourteen grapes, and six bananas." It should depend on the teacher, whether or not you have to use the comma before "and" and the next object.
Gandalf gets Beorn to shelter thirteen dwarves by bringing them in two by two while he tells an exciting story. ... the mention of the dwarves being attacked by Goblins eventually interests about the dwarves. Beorn doesn't like Goblins or the wolves.
Out of the following choices given, the sentence that contains an infinitive is "Heather wants to go to the store with us." The infinitive is "to go." The correct answer is A.