The well-covered passageway gave shoppers protection______the summer sun and the winter rain.

C from
因为前面是protect的同源词,所以用介词from,一般而言,同源词的动词、形容词、名词和后面跟的介词是相同的,如differ,difference,different后面都用from“与.不同”,其他几个都不能和protection连用表示“保护（使不受 .困扰）”