The correct answer is cluster.
A. inability to speak
B. unintelligible talk
The correct answer is (D) A cluster, often disorderly; a group; a flock (of geese).
Gaggle comes from gagelen (to cackle).
Examples of use:
- He was surrounded by a gaggle of his dubious gambling companions.
- A gaggle of housewives awaited the opening of the advertised fire sale.