Please explain the math behind this

Horace bought 10,000 shares of LaLa at $40 per share. Two years later he sold the stock for $80 per share. LaLa declared and paid a dividend of $4 per share during the period Horace held the stock. What was Horaces holding period return?

a. 110%.

b. 100%.

c. 10%.

d. 210%.