Which of the following is the correct order of floral organs from the outside to the inside of a complete flower?

A)petals → sepals → stamens → carpels
B)sepals → stamens → petals → carpels
C)spores → gametes → zygote → embryo
D)sepals → petals → stamens → carpels
E)male gametophyte → female gametophyte → sepals → petals