A.
Fill in flexat the first underline, fill in align-items at the second underline.
B.
Fill inflexat the first underline, fill inalign-contentat the second underline.
C.
Fill inblockat the first underline, fill inalign-itemsat the second underline.
D.
Fill inblockat the first underline, fill inalign-contentat the second underline.