Read this body paragraph from an essay about poaching.

International laws are rules that different countries agree to follow. Strong international laws make it more difficult to sell poached animal parts. For example, international law resulted in the cooperation and training of law-enforcement groups from Kenya, Tanzania, and Thailand. As a result, large shipments of elephant ivory were discovered before they left an airport in Kenya. Actions like this help countries stop groups that benefit from poaching.

Which statement from the paragraph is a topic sentence?

“International laws are rules that different countries agree to follow.”
“Strong international laws make it more difficult to sell poached animal parts.”
“For example, international law resulted in the cooperation and training of law-enforcement groups.”
“Actions like this help countries stop groups that benefit from poaching.”