Francisco Purchased a Machine on Jan 1, 2010 for $750,000

Francisco purchased a machine on Jan 1, 2010 for $750,000. The machine had an estimated useful life of 5 years and an estimated residual value of $50,000. The company uses straight-line depreciation and records monthly depreciation. The machine was sold on December 31, 2013 for $140,000. What was the gain/loss on disposal of the machine?

A) $10,000 gain.
B) $10,000 loss.
C) $50,000 gain.
D) $50,000 loss.