Select the most appropriate synonym to replace the underlined word in the…

The word 'altruistic' describes behavior characterized by selfless concern for the well-being of others.
To find the most appropriate synonym, we must identify a word with a similar meaning related to generosity and helping others.
Option A, 'philanthropic,' means promoting the welfare of others through charitable actions, which aligns perfectly with the definition of altruistic.
In contrast, 'phantasmal' (Option B) refers to something ghostly or illusory, which is unrelated to human behavior.
'Phenomenal' (Option C) means extraordinary or remarkable, and 'phonotypical' (Option D) relates to speech patterns; neither captures the essence of selflessness. Therefore, 'philanthropic' is the only choice that maintains the original sentence's meaning regarding selfless acts.