Yeast reproduces by
(a) budding
(b) spore formation
(c) binary fission
(d) fragmentation
Yeast reproduces by the process called budding. Budding is a type of asexual reproduction in which a small outgrowth emerges from the parent's body. On attaining maturity it detaches from the parent's body and develops into an independent individual.
Hence, option 'A' is the correct answer.