Sonali invests money in three different schemes for 6 years, 10 years and 12 years at 10% p.a., 12% p.a. and 15% p.a. at simple interest respectively. At the completion of each scheme, she gets the same interest. What is the ratio of her investments?
A6 : 3 : 2
B3 : 2 : 1
C3 : 4 : 5
D2 : 3 : 6