我在指考范文看到一句
To sum up, food and art may be the best incentives to arouse a conversation and achieve notice in the local markets, that leads to my choice for activities.
为什么这里逗号后面可以用that ?
谢谢！

补述

那请问逗号后面不是不能用that吗？ 那我这句用which可以吗？