[正答]
A
※国試ナビ4※ [104H019]←[国試_104]→[104H021]
[★]
B
※国試ナビ4※ [104H020]←[国試_104]→[104H022]
※国試ナビ4※ [104H018]←[国試_104]→[104H020]
.