It is to be noted that the word that is underscored is Filial. The word Filial is an adjective that is used to describe a noun that relates to ones offspring(s) or child(ren). From the options given, therefore, the best phrase or synonym that defines the italicized word is "befitting of a son or daughter" (Option D)
What is a synonym?
A synonym is a word that when used to replace the source word, serves the same meaning especially within the context in which the source word was used.
Hence, the best phrase or synonym that defines the italicized word is "befitting of a son or daughter" (Option D)
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