(A) The correct answer is $A$. The stigma is the receptive part of the carpel (pistil),which is a vegetative organ of the flower,thus representing the

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sporophyte and gametophyte respectively

(A) The correct answer is $A$. The stigma is the receptive part of the carpel (pistil),which is a vegetative organ of the flower,thus representing the sporophytic generation $(2n)$. The pollen grain is the male gametophyte,which develops from the microspore and represents the gametophytic generation $(n)$.