While a leg cast is drying,
a. cover it tightly so moisture will not be lost.
b. maintaining general alignment is not important.
C. carefully observe the extremities for circulation.
d. use only fingertips to handle the cast.

I believe the answer would be to carefully observe the extremities for circulation.

A: the cast needs to dry out, but you also want to decrease any swelling. So elevate the extremity and evenly dry the cast by turning it every 2 hours.

B: general alignment is important, you want it to heal properly

C: Compartment syndrome (emergency) can be a complication, and it is extremely important to monitor. Check the 6 Ps (pain that is not relieved, paresthesia, pallor, pulselessness, poikilothermia, paralysis)

D: you want to handle the casts using the palms of your hands, not the finger tips.