Let's assess the stimulus first. Ann says "All the campers at Camp Winnehatchee go to Tri Cities High School."
You can diagram this sentence as CCW ==> TCHS [if you're a camper at Camp Winnehatchee, you go to Tri Cities High]
Bill misunderstands Ann's assertion. He thinks she said that if you are a student at Tri Cities, you must go to Camp Winnehatchee. That's an incorrect reversal of what Ann actually said. Because of this misunderstanding, Bill puts forth what he thinks is a counterexample to Ann's claim: that some Tri Cities students are campers at Camp Lakemont. Of course, that's totally possible, and consistent with what Ann actually said. The sufficient condition in Ann's statement is going to Camp Winnehatchee, not being a Tri Cities High student.
The question stem asks you to describe how Bill has misinterpreted Ann's statement. This is answer choice (E): Only campers at Camp Winnehatchee are students at Tri Cities High School. You could diagram this as TCHS ==> CW [If you are a Tri Cities High student, you go to Camp Winnehatchee]
Hope this helps. Please let us know if you have any additional questions.
