Answer:
The answer is: Deciding on an outfit is frustrating I want to look unique.
Step-by-step explanation:
A fused sentence is formed by two independent clauses, let's rememeber that an independent clause "stands alone" that means, it doesn't need to be added further information, unless wanted too, as it looks ok without anything else. Another characteristic of a fused sentence is that both independent clauses are not linked with punctuation, as you can see, this sentence is the correct one as there should be a comma after frustrating; also you know both are independent clauses as if your leave either of the alone, they both make completely sense. On the other hand, the other options are linked with conjuctions or punctuation.