How does nonshivering thermogenesis heat the body? Please Check.

Please check my answers.

The phenomenon of autocatalysis is involved in a positive feedback loop that activates certain digestive enzymes. Which likely results when the digestive enzymes are activated?
      a.) the suppression of other enzymes
      b.) additional enzyme activation
      c.)a chemical that blocks additional enzyme production<----
      d.)eventual inactivation of the enzymes
      e.) a release of hormones that trigger satiety

How does nonshivering thermogenesis heat the body?   
     a.)by increasing cellular respiration<----
     b.)by increasing the amount of brown fat an animal has
     c.)by increasing the number of mitochondria in the body
     d.)by decreasing the rate of metabolism
     e.)by decreasing ATP production