A． whether they can get additional venture capital from investment bank
B． whether they can increase revenue from selling music downloads and band-related good
C． whether they can find suppliers to sell physical things in the Loung
D． whether they can develop a critical mass of users and attract mass-market advertiser

参考答案D

解析:【定位】根据题干中的big question定位到最后一段。
【解析】从最后一段第2句得知Doppelganger公司所面临的大问题就是D项所表达的内容，即能否吸引足够多的用户形成中坚力量、并博得大众市场广告客户的青睐。
【难句分析】