Five friends Alastair, Bell, Cook, Darren, and Eoin appeared in an aptitude test. Alastair scored exactly 1212of Darren's score, whose score was 1515th more than Cook's score. Eoin scored 2525th more than Cook and Darren's score was 3232 times that of Bell's score. If the average score (arithmetic mean) of the group was 50, what was the range of the scores of the group?
A. 25
B. 30
C. 35
D. 40
E. 50

[spoiler]OA=D[/spoiler]

Source: e-GMAT