阅读理解。阅读下列短文, 从给的四个选项 (a、b、c和d) 中, 选出最佳选项。
in 1939，two brothers，mac and dick mcdonald，started a drive-in restaurant in san bernadino，california.they carefully chose a busy corner for their location.they had run their own businesses for years，first a theater，then a barbecue(烤肉)restaurant，then another drive-in.but in their new operation，they offered a new，shortened menu：french fries，hamburgers，and sodas.to this small selection they added one new idea：qui
