Respuesta :
The correct answer is on the contrary.
If something is contrary, it means that it is the opposite, completely different from something else. If you want to show a contrasting (opposing, different) thought, then you can use the phrase on the contrary. You can state one thing, add on the contrary, and then explain something completely different.
Answer:
"On the contrary"
Explanation:
In this passage, the expression "on the contrary" indicates the introduction of a contrasting thought. This is because the phrase signals that the previous idea will be in opposition to the idea that is about to be presented. In this case, the first idea states that charity does no good because it is selfish. However, the second statement introduces the contrasting thought that selfishly motivated giving actually does a lot of good in the world.