[正答]
D
※国試ナビ4※ [107I018]←[国試_107]→[107I020]
[★]
C
※国試ナビ4※ [107I017]←[国試_107]→[107I019]
※国試ナビ4※ [107I019]←[国試_107]→[107I021]
.