Answer:
breakfast/she
Explanation:
The main clause in this sentence is "she was hungry again within an hour," since it can stand on its own as a sentence, while the clause that starts with "Although..." is subordinate to it. "Brennen" is the subject, "ate" is the verb, and the object of this subordinate clause is a list of noun phrases: "four pancakes, two pieces of bacon and five strawberries," ending with the prepositional phrase "for breakfast" to complement the verb "ate." All these elements are within the same clause, making answers 1 and 2 incorrect. The last option is incorrect too because it occurs in the middle of the independent clause.
