The following graph below shows the number of students (in thousands) who were admitted to three different courses in 5 years in a university. Study the graph and answer the question.

What is the ratio of the number of students who were admitted to course A in the year 2007 to that of students who were admitted to course C in the year 2009?

A

$$\frac{23}{20}$$

B

$$\frac{19}{20}$$

C

$$\frac{21}{20}$$

D

$$\frac{9}{20}$$