As demonstrated by the experiments of Huey and colleagues (1989)on thermoregulation in garter snakes,snakes have a wide range of options for behavioral thermoregulation during the day―so long as they avoid thin rocks or direct sunlight at noon―but during the evening they are most often observed ________.

A) only on or under rocks that are of medium (20-40 cm) thickness
B) on or under rocks that are of medium (20-40 cm) or thick (>40 cm) thickness
C) on or under rocks that are of thin (<20 cm) or medium (20-40 cm) thickness
D) only on or under rocks that are thick (>40 cm)
E) avoiding rocks and moving to a deeper location under the surface