An iMac starts, but becomes unresponsive after the login screen. How can you easily disable login items to see if they are causing the issue?

A.
Hold the shift key at start up to Safe Boot.

B.
Start the iMac to OS X Recovery and reinstall OS X Mountain Lion.

C.
Hold command S to enter Single User mode, then move login items with the command line.

D.
Start the iMac to OS X Recovery, then open the terminal and use it to delete all login items.