It seems that mobile phone use will just keep on rising. The entire world population owns or has access to a mobile phone.

A It seems that mobile phone use will just keep on rising because the entire world population owns or has access to a mobile phone.

B Mobile phone may just be used more when the entire world population owns or has access to a mobile phone.

C It seems that mobile phone use will just keep on rising, until the entire world population owns or has access to a mobile phone.

D Mobile phone use may just keep on rising as the entire world population owns and has access to a mobile phone.