The Most Important Innovation of Francis Cabot Lowell's Waltham Operation

The most important innovation of Francis Cabot Lowell's Waltham operation was to

A) divide the tasks of spinning and weaving into separate operations.
B) accumulate the capital of a wide-ranging group of associates.
C) use New England's swift-flowing streams to power his mills.
D) combine the steps of cotton production under one roof.