The answer is letter b and d.
Land breezes occur at night and in the early morning.This winds occur when the land is cooler than the sea. This happens when the air cools in the night time (as there is less heating from the sun) it contracts.
Just like land breezes, mountain breezes occur at night due to the reversed process that took place in the formation of valley breezes.
More information about local winds:
>>>A sea breeze or on shore breeze is a gentle wind that develops over bodies of water near land.
>>>Mountain and valley breezes form through the same process as to sea and land breezes. At daytime, the sun heats up valley air rapidly. Convection rises the air causing a valley breeze. At nighttime, the process is reversed. Mountain air cools rapidly at night and "falls" downslope, causing the formation of a mountain breeze.