Double fertilization process means
(A)Process of joining a female gametophyte with two male gametes.
(B)Fusion of male gamete nucleus with secondary nucleus
(C)Fusion of two polar nuclei with each other
(D)Fusion of male gamete nucleus with egg nucleus

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Hint: Double fertilization is process where out of two sperm cells, one fuses with the egg cell and the other fuses with two polar nuclei which result in a diploid (2n) zygote and a triploid (3n) primary endosperm nucleus (PEN) respectively. Since endosperm is a product of the fusion of three haploid nuclei, it is called triple fusion.

Complete answer:
Let’s discuss the question and find the proper answer.
A pollen grain is a protective structure that contains sperm cells.After pollen grain lands on a proper stigma,it absorbs water and grows by creating a dust tube. That creates between the cells of the style toward the ovary. The core of the generative cell isolates by mitosis and structures two sperm. While the tip of the pollen tube develops toward the miniature Pyle. Its appearance shows the demise of one of the two collaborations. It will give a path into the undeveloped organism sac.
Before getting the female gametophyte, the egg is prepared by one sperm, creäte a zygote. The blend of the two sperm cells with various cores of the female gametophyte is denoted as double fertilization. This affirms that endosperm grows just in ovules where the egg has been fertilized.it keeps angiosperms from wasting supplements on infertile ovules.

Additional Information: The female gametophyte of gymnosperms is an enormous and multicellular structure that serves the twofold capacity of supporting the gametes just as sustaining the developing incipient organism which is as opposed to the state in angiosperms, wherein female gametophyte is minute and normally eight-nucleated with a solitary operational gamete.

Hence, option (A)Process of joining a female gametophyte with two male gametes is the correct answer.

Note: Double fertilization provides stimulus to the plant as the ovary develops into a fruit. Due to the fusion of male and female haploid gametes, a diploid zygote is formed. The zygote develops into an embryo, giving rise to a new plant.