Choose the option which best expresses the meaning of the given word.
HARBINGER

a) pilot
 b)forerunner
 c)steward
d) messenger

Hint: Synonyms are words or phrases that mean exactly or nearly the same as another word or phrase.

Complete step-by-step answer:

In the given question, the word ‘harbinger’ refers to something that precedes and indicates the approach of something or someone.
Let us analyze the options given to us in this question:
Option (a.), 'pilot', refers to someone who is licensed to operate an aircraft in flight.
Therefore, option (a.) is incorrect as its meaning is not synonymous to that of the given word ‘harbinger’.

Option (b.), ‘forerunner', refers to a person who goes before or announces the coming of another.
Therefore, option (b.) is correct as its meaning is synonymous to that of the given word ‘harbinger’.

Option (c.), ‘steward', refers to someone who manages property or other affairs for someone else.
Therefore, option (c.) is incorrect as its meaning is not synonymous to that of the given word ‘harbinger’.

Option (d.), ‘messenger', refers to a person who carries a message.
Therefore, option (d.) is incorrect as its meaning is not synonymous to that of the given word ‘harbinger’.

Note: Substitute the given word with each word in the options and choose the word which does not conflict with the context provided by the given word if you don’t know the definition of the given word and have only used it in some given context previously.