A held-to-maturity investment with a book value of $6,000,000 is determined to be impaired in 2017 and is written down to $2,000,000. In 2018, the investments value increases to $6,500,000. Assume amortized cost without impairment is $6,000,000.

In 2018, following U.S. GAAP:

a.A $4,000,000 gain is reported in income.

b.A $4,500,000 gain is reported in income.

c.A $4,000,000 gain is reported in OCI.

d.No gain is reported.