Double fertilization and triple fusion were discovered by.A. HofmeisterB. Nawaschin and GuignardC. LeeuwenhoekD. Starburger

The correct answer is B. Nawaschin and Guignard.

Explanation:

Double fertilization and triple fusion are unique features of angiosperms. This process involves the following:

Double fertilization:

One male gamete fuses with the egg cell to form a diploid zygote (syngamy).
The other male gamete fuses with two polar nuclei to form a triploid primary endosperm nucleus (triple fusion).
Triple fusion:

The fusion of one male gamete with two polar nuclei is called triple fusion. This forms the triploid nucleus, which later develops into the endosperm that provides nourishment to the developing embryo.
This discovery was made independently by Sergei Nawaschin and Léon Guignard in the late 19th century while studying the reproductive processes in flowering plants. Their work clarified the mechanism of fertilization in angiosperms, establishing this unique process of double fertilization.