Answer:pathos
Step-by-step explanation:
Pathos is using ways that appeal to the aundience's emotions by using techniques that you know will eventually evoke the emotions that they already have about certain issues.
It is usually useful when one want to persuade a certain audience about a particular topic
When you tell people about let suffering and in addition show them the pictures , this automatically evoke feeling of empathy and strong emotions towards wanting to do something to change that , this will work for the activists to find more people who support his ideas on the matter.