I have this one if any can help:
A large cumulus cloud with a base of 2000 ft is reported at an airfield,if the surface temperature is 21 degrees celsius the height of the freezing level in the cloud is likely to be:
A) 10330 feet
B) 7000 feet
C) 10500 feet
D) 18000 feet
Any one please to help me resolve this one with explanations if possible
Best regards