Select the INCORRECTLY spelt word.

Correct option is C

Option (c) is incorrectly spelt.
Correct spelling is: “ Robust” — meaning strong, healthy, or vigorous. (मज़बूत)
Example: The athlete has a robust physique.
Meanings of all the options:
· (a) Xylophone: A musical instrument. (वाद्य यंत्र)
· (b) Oligopoly: A market condition dominated by a few firms. (कुछ कंपनियों द्वारा वर्चस्व)
· (c) Robbust: Incorrect spelling of "Robust" (गलत वर्तनी)
· (d) Zenith: The highest point or peak. (शिखर)