ALLGO Announced at Time T That It Was Acquiring DoLittle

ALLGO announced at Time t that it was acquiring DoLittle Industries.There were no other announcements affecting these firms.ALLGO's stock had daily returns of -.2,+.1,-.5,-.1,+.1 for Time _{t - 2} to Time _{t + 2},respectively.The daily returns on the market were -.1,+.2,+.1,-.2,and +.2 for Time _{t - 2} to Time _{t + 2},respectively.What is the cumulative abnormal return for these five days?

A) -.7
B) -.8
C) -.5
D) -.10
E) -.3