Final answer:
The detail that best reveals Salva's uncle's feelings for him could be any of the presented options, depending on the context. It could be his use of Salva's first name that implies endearment, or his readiness to fight that signifies care. However, without more details, it's hard to be definitive.
Step-by-step explanation:
The detail that best shows how Salva's uncle feels about him could be any of the given options, depending on the context, since feelings can be shown in a variety of ways. However, in many cultures, the use of someone's first name is indicative of closeness or affection. Therefore, B. Salva's uncle uses his first name, might suggest a sense of familiarity and endearment. Also, speaking in a gentle voice as mentioned in option A could be indicative of compassion. On the other hand, Salva's uncle saying he will fight could mean he cares about Salva's safety. Lastly, looking away might be a sign of worry or discomfort with the situation at hand. Without more specifics about these situations, it's challenging to definitively state which action represents his feelings best.
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