A tower in Boughton, Chester, UK, was built to manufacture what, following a process pioneered by William Watts in the 1780s?

Option A

The tower was one of the earliest built to manufacture lead shot using the method pioneered in the 1780s by the Bristol inventor William Watts. ... Molten lead was poured through a pierced copper plate or sieve at the top of the tower, with the droplets forming perfect spheres by surface tension during the fall; the spherical drops were then cooled in a vat of water at the base. Watts' process was less labour-intensive than the earlier method of casting shot in moulds. An early use of the tower was to make lead shot for muskets in the Napoleonic Wars. Although other methods were developed to manufacture shot during the 20th century, the Chester tower was still in use as late as 2001.