Answer: The description that best reveals the meaning of what the family would be doing is "complaining about their hunger".
Step-by-step explanation: In the sentence provided, the speaker compares the men in her family with wolves since she believes that, if dinner were late, they would howl and gnash. The verb "howl" is used to refer to the action of wolves of giving a long and loud cry, while the verb "gnash", which is also related to wolves, means to strike the teeth together in order to show anger. When animals are hungry, they howl and gnash; therefore, the speaker uses these two verbs in order to suggest that, if dinner were late, her family would complain strongly about their hunger.