What did James Watt do to the steam engine to start the Industrial Revolution?(1 point)

Responses

He attached it to a locomotive.
He attached it to a locomotive.

He improved the existing design to make it more efficient and cost effective.
He improved the existing design to make it more efficient and cost effective.

He applied the use of horses to the steam engine to make it faster.
He applied the use of horses to the steam engine to make it faster.

He invented the very first one.