请教SAT高手,感谢!The reason many people are careless in driving is

请教SAT高手,感谢!The reason many people are careless in driving is because of their too……
The reason many people are careless in driving is because of their too easily being distracted by what is happening around them.
A. are careless in driving is because of their too easily being
B. as driving being careless is that it is too easy for them to be
C. are careless while driving is the case of one’s being
D. lack care while driving is their too easily being
E. drive carelessly is that theyare too easily