Several years ago, Mr. Davis bought an antique clock. Since then, it has increased in value. In this graph x represents the number of years he has owned the clock, and y represents the value of the clock (in dollars). Which of the following situations is represented by the graph below?

A.
Mr. Davis bought a clock worth $300. Each year the value of the clock has increased by $125.
B.
Mr. Davis bought a clock worth $300. Each year the value of the clock has increased by $50.
C.
Mr. Davis bought a clock worth $300. Each year the value of the clock has increased by $200.
D.
Mr. Davis bought a clock worth $300. Each year the value of the clock has increased by $100