Answer:
The soup kitchen is extremely valuable for those struggling to get enough to eat.
Step-by-step explanation:
A supporting detail is an additional point that gives credence to the main point. The main point in paragraph 3 is;
"Service is valuable in ways that cannot be measured in dollars."
To support this main point, the additional detail of the soup kitchen is provided. The Soup Kitchen provides a service which is valuable because it enables struggling people to get enough to eat. This value cannot be measured in dollars.