Fred’s class is designing a toy car powered by solar energy. They design and test four prototypes. Descriptions of the designs and the results of the tests are shown below. Design Location of
Solar Panels
on Car Presence
of Battery Runs on
Cloudy Day Running Time
Using Only
Solar Energy
V roof no yes 5 minutes
W bottom no no will not run
X back no yes 3 minutes
Y doors yes yes 2 minutes

Fred's class wants the car to run on solar energy for as long as possible, but they also want it to be practical for use in the real world. Which designs should Fred's class combine to make the best solar car?
A.
design V and design W
B.
design V and design Y
C.
design W and design X
D.
design X and design Y