"Now I say by hook or crook this peril too shall be
something that we remember."
This idiom is an example of what literary term?

Explanation:

From the old norse byname krókr meaning 'crook', 'bend', originally possibly ... He can be the example of what frodo would be if he had kept the ring for long. ... Normally a writer of textbooks and dictionaries—utterly self-contained literary ... us? now i say by hook or crook this peril too shall be something that we remember.

the correct answer is a.

since in the sentence the word beacon is used as "guide".

lighthouse:

high tower located on the coasts and ports that emits a powerful light at intervals to guide navigators at night.

luminous tower.

beacon synonyms as a guide: lighthouse, north, tower