单选题 "Initial expectations were too great, "explained Alex Slawsby, senior analyst of mobile devices at IDC (International Data Company)of US. " It was a solution to a problem no one thought they had. "
But now, helped by growing industry support, shipments of Bluetooth devices are expected to increase about 60 per cent in 2004 to 88 million units. That's up from 55 million sold in 2003, according to US research firm Gartner.
How many units of Bluetooth were sold in 2003?

• A. 88 million
• B. 55 million
• C. 33 million
• D. 60% more than the previous year.