Correct option is A
The correct option to fill in the blank is (a)
the.
“The” is used before
superlatives or
specific choices, like “the best.” Here, it indicates a specific route that is most effective.
Example: She is the best player on the team.
Explain why other options are incorrect:
· (b) an – used before words beginning with vowel sounds, not superlatives
· (c) No article required – incorrect, as “best” needs a definite article
· (d) a – used for singular, non-specific nouns (एक सामान्य वस्तु)
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Grammar Information Booster: Superlatives like “best” always take “the” before them.