It's a pronoun problem. The company will increase its, not their. "Company" is a singular antecedent. so it has to be "its"... So choose BDE
B and E are essentially the same, just with the information in a different order. In both of them,"increase" is too far away from "shares". In E, "to 10 percent from 6 percent" is very awkward,e.g.when we tell our clients the increase of something, we always say "from ...to ...pct", right? D got a nice structure: Idea(share), more info (from 6 to 10), idea (market), more info (which...)In addition,"in" goes with increase and share... it works with that verb and noun.