challenge: What was a key change made to the cab of International's 2000 Class 8 highway trucks to improve driver visibility and comfort?
  
  A. The windshield was divided into three panes to reduce glare
  B. The firewall of the cab was moved backward to accommodate a larger engine
  C. The base of the windshield was raised to improve aerodynamics
  D. The firewall of the cab was moved forward to enlarge the drivers' compartment
  Answer: 