The answer is D. solace ... enumerated.
"Solace" means comfort or consolation in a time of distress or sadness, which fits the context of her finding comfort after hearing about her mother's kindnesses.
"Enumerated" means to list or mention one by one, which indicates that she heard about her mother's many kindnesses that were listed or recounted by friends and coworkers.
So, the correct sentence would be:
The death of her mother was quite a blow, but she was able to experience solace after hearing of her mother's many kindnesses enumerated by friends and coworkers.