A neutral substance will have a pH closest to which of the following?

A neutral substance will have a pH closest to which of the following?
 
  a. 0
  b. 2
  c. 5
  d. 7

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(Question #2) Some breath-testing devices for alcohol use what kind of light to measure the quantity of alcohol trapped in a chamber?
 
  a. Visible
  b. Ultraviolet
  c. Infrared
  d. Colored

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(Question #3) Field sobriety tests that can be employed to ascertain the degree of an individual's alcohol impairment normally do not include which of the following?
 
  a. Portable, roadside breath tester
  b. Horizontal-gaze nystagmus
  c. Gas chromatography
  d. Walk and turn

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(Question #4) _______ entails a variety of gaming strategies that attempt to imitate a more complex social reality.
 
  Fill in the blank(s) with correct word