Blanco Company purchased $200$ of the $1,000$ outstanding shares of Darby Company's common stock for $$600,000$ on January $2,2025.$ In $2025,$ Darby declared dividends of $$100,000$ and reported earnings of $$400,000.$ If Blanco uses the fair value method of accounting for its investment in Darby, the balance in Equity Investments $($Darby$)$ on December $31,2025$ should be

a$.$ $$580,000.$

b$.$ $$660,000.$

c$.$ $$600,000.$

d$.$ $$680,000$