Answer:
a. Other Comprehensive income for 2020 = Unrealized holding loss = -$9.9 million
b. Comprehensive income for 2020 = Net income - Unrealized holding loss = $1,180 million -$9.9 million = $1,170.1 million
c. Accumulated other comprehensive income at December 31, 2020 = Accumulated other comprehensive income - Other Comprehensive income for 2020 = $55.2 million -$9.9 million = $45.3 million