Answer:
The correct answer will be option-C.
Step-by-step explanation:
Alternation of generation represents the life cycle where the life of a plant is divided into two phases: haploid gametophyte and diploid sporophyte. Alternation of generation has been observed in the whole plant kingdom.
In the given question, the diagram represents alternation of generation in angiosperms as it shows a reproductive structure called flower which is a unique feature of the angiosperm.
Thus, Option-C is the correct answer.