They come here on bootless errand

choose the option opposite in meaning to the word or phrase in italics

They come here on bootless errand

A. worthwhile
B. vain
C. delusive
D. intended

Correct Answer:

Option A – worthwhile 

Explanation

The word bootless means ineffectual, useless of a task or undertaking, while the answer worthwhile means worth the time, effort spent
Bootless explains that the errand was useless while worthwhile explains it was the effort, which is also synonymous to the word useful