Why can’t you use your laptop expansion slots?

You want to add a FireWire port to your laptop, so you’ve selected a CardBus adapter that includes multiple ports on a single expansion card. When you slide the card into your laptop, however, the card will not insert completely into the slot. What’s the most likely cause of this problem?

A) The CardBus card is faulty

B) The laptop’s CardBus slot is disabled

C) The laptop slot is an ExpressCard slot

D) The FireWire adapter requires additional power

E) You need a big, big hammer