Male sterility was reported by

Answer: Option B

Male sterility was reported by Koelreuter.
Joseph Gottlieb Kolreuter was the first to document male sterility in plants. In the 18th century, he reported on anther abortion within species and specific hybrids.
This could be because the male sporophyte and gametophyte are less protected from the environment than the ovule and embryo sac. Male-sterile plants can set seeds and propagate.