Which topic sentence should be added to this body paragraph?

more than likely, fellow volunteers will have many common interests and ideals. after all, volunteers usually seek opportunities to use their time and talents for issues they care about, and this is often a good starting point for many friendships. as co-volunteers, hours will be spent together learning from one another and inspiring each other while working to achieve a common goal. teaming up with others to solve community problems and making changes for the better, not surprisingly, often leads to long-lasting bonds.

She took up a scalpel and slit the monkey's abdomen, making a slow and gentle cut, keeping the blade well away from her gloved fingers. the spleen was puffed up and tough, leathery, like a globe of smoked salami. she did not see any bloody lesions inside this monkey. she had expected that the monkey's interior would be a lake of blood, but no, this monkey looked all right, it had not bled into itself. if the animal had died of ebola, this was not a clear case. she opened up the intestine. there was no blood inside it. the gut looked okay. then she examined the stomach. there she found a ring of bleeding spots at the junction between the stomach and the small intestine. this could be a sign of ebola, but it was not a clear sign. it could also be a sign of simian fever, not ebola. therefore, she could not confirm the presence of ebola virus in this animal based on a visual inspection of the internal organs during necropsy.