Regarding consciousness, which of the following statements is FALSE?

Regarding consciousness, which of the following statements is FALSE?
 
  a. Waking consciousness changes regularly throughout the day, ranging from focused awareness to divided consciousness to drifting consciousness.
  b. Research on multitasking generally supports the common perception that to do two things at once is to do neither..
  c. Negative ways of thinking act like mental filters in one's consciousness that can skew how a personinterprets and reacts to events in their lives.
 d. Drifting consciousness often leads to daydreaming.
  e. Since altered states of consciousness are produced by taking drugs, people should avoid attempting to change their states of consciousness.