Select the option that can be used as a one-word substitute for the highlighted group of words.
She is proficient in speaking many languages.

Correct option is B

The correct one-word for the given group of words is Multilingual.
A multilingual person is someone who can speak, read, or write in many languages fluently. (हिंदी: जो कई भाषाएँ बोलने में सक्षम हो)
Example: She is multilingual and can converse in French, German, and Japanese.
Meanings of the given other options:
· Option (a) Monolithic: Uniform and indivisible (हिंदी: एकसमान और अविभाज्य)
· Option (c) Heterolinguistic: Pertaining to multiple languages but rarely used in practice (हिंदी: विभिन्न भाषाओं से संबंधित)
· Option (d) Bilingual: Able to use two languages fluently (हिंदी: द्विभाषी)