Five friends Alastair, Bell, Cook, Darren, and Eoin appeared in an aptitude test. Alastair scored exactly \(\dfrac12\) of Darren’s score, whose score was \(\dfrac15 th\) more than Cook’s score. Eoin scored \(\dfrac25 th\) more than Cook and Darren’s score was \(\dfrac32\) 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

Answer: D

Source: e-GMAT