Directions: The graph below shows the end of the month market values of 4 shares for the period from January to June. Answer the following questions based on this graph.

An individual decides to sell 1 share of C and 1 share of D to buy 1 share of A at the end of the month. What can be the individuals greatest gain from this decision, due to share value changes?

A. 5

B. 10

C. 15

D. None

Please do not use chat terms. Example: avoid using "grt" instead of "great".