What does the phrase, "When some people talk about money They speak as if it were a mysterious lover Who went out to buy milk and never Came back" mean (From Tracy K. Smith "The Good Life")

The question below refers to the selection “ozymandias” by percy bysshe shelley. the traveler seems to believe that — a. monuments are eternal b. the passage of time is necessary and inevitable c. we must preserve relics of past civilizations d. even the greatest works are destroyed by time