The spinning jenny A. wove cloth quickly
B. was powered by water
C. made production slow
D. spun many threads at one time

D

Explanation:

James Hargreaves' 'Spinning Jenny', the patent for which is shown here, would revolutionise the process of cotton spinning. The machine used eight spindles onto which the thread was spun, so by turning a single wheel, the operator could now spin eight threads at once.

I would say D.

Explanation:

Because the ‘Spinning Jenny’ is a spinning machine with multiple spinning frames. This allowed the workers to work with eight or more spools of thread at once.