At present, Ami’s age is twice Dio’s age and Cami is two years older than Ami. Two years ago, the respective ratio between Dio’s age at that time and Cami’s age at that time was 4 : 9. What will be Ami’s age four years hence?

• A. 40 years
• B. 30 years
• C. 42 years
• D. 36 years
• E. 48 years