Which of the following is the fourth sentence after rearrangement?

The correct order is BACDE. 'B' is the introductory sentence as it introduces the subject 'Google docs'. 'A' talks about what happened after the launch of Google Docs and what was the users' response toward it (clues can be taken from 'it' in sentence 'A', which refers to 'google docs' mentioned in 'B'). Sentence C which throws light upon other features of google docs will follow next in the sequence as it builds upon the premise given in B & A; sentence D, which gives us an example of additional purposes (discussed in C) will follow next. Sentence E concludes the passage by stating how these features of google docs was a competition to Microsoft Word, which till then was the lone holder of the market. After rearrangement, 'D' is the fourth sentence.