Correct option is B
• Given word – Arcane: Arcane means mysterious, secret, known by only a few, especially something that is difficult to understand.
(Hindi meaning: गूढ़ / रहस्यमय / केवल कुछ लोगों को ज्ञात)
Example: The professor explained the arcane rules of the ancient manuscript.
• Correct antonym – Common: Common means ordinary, widely known, familiar to many people. This is the opposite of “arcane” (secret/known by few).
(Hindi meaning: सामान्य / आम / प्रचलित)
Example: It is common knowledge that the Earth revolves around the Sun.
• Synonyms of Arcane: mysterious, obscure, secret, esoteric.
• Antonyms of Arcane: common, familiar, well-known, ordinary.
• Meanings of other options (why they are incorrect):
• (a) Reticent – reserved; not revealing thoughts or feelings (Hindi: संकोची / कम बोलने वाला)
• (c) Dangerous – likely to cause harm (Hindi: खतरनाक)
• (d) Languid – lacking energy; slow and relaxed (Hindi: सुस्त / थका हुआ)
So, Arcane = secret/known by few, hence its opposite is Common = widely known.