On carribean island with moutains, the windward slopes facing the trade winds force air upwards, causing rainfall. as a result, areas immediately to the leeward of the moutains have a microclimate with sparse precipitation callen a/an

Areas immediately to the leeward of the mountains have a microclimate with sparse precipitation called a rain shadow.

It is described as " a patch of land that has been forced to become a desert because mountain ranges blocked all plant-growing, rainy weather" On one side of the mountain the weather is wet, rainy and snowy. And on the other side (the rain shadow) there are no precipitations. 

Pretty ssure the answer re her answer is b hope this : )