Correct option is C
The correct one-word for the given group of words is (c)
Extemporary.
Extemporary means
spoken or done without prior planning or preparation, usually in reference to a speech or performance. (बिना तैयारी के, तात्कालिक)
Example: She gave an
extemporary speech that impressed everyone.
Meanings of the other options:
· (a)
Uncontemporary – Not modern or current (अप्रचलित)
· (b)
Temporary – Lasting for a short time (अस्थायी)
· (d)
Contemporary – Belonging to the same period of time (समकालीन)