Which underlying theme of the short story "a rose for emily" by william faulkner is evident in this line?
alive, miss emily had been a tradition, a duty, and a care; a sort of hereditary obligation upon the town . .
illusion versus reality
man's struggle against isolation
custom versus change
the power of death

"the day we found the sharks' teeth" i would say highlight the element of the plot as it sets its boundaries and centers the adventures of them being on a boat and cleaning spit of sand.

faithful servants eumaeus and philaetius:

his ragged vest then drawn aside disclosed the sign conspicuous, and the scar exposed: eager they view'd, with joy they stood amazed with tearful eyes o'er all their master gazed:

these servants know ulysses by the scar he got when he was a child - so when he showed them the mark, they immediately knew this is truly their master and they hugged him, finally starting to believe his words.