51.Which of the following is true of the LoB when it opens?

51.Which of the following is true of the LoB when it opens?
　　a.It offers better learning tools
　　b.It reaches users in different ways
　　c.It provides users with smart phone
　　d.It allows users to enrich its material
　　e.It gives non-stop physical and digital services
　　A.a,b,d B.a,c,e
　　C.b,c,d D.b,d,e
为什么C不对,原文有写Subetns,a digital design company,is developing what it calls “calargod reality” project.It is about the use of an exciting smart phone,an important part of the which is the early stages of development .
这是2011年四川高考阅读C篇