Final answer:
Both the assertion that asexual reproduction requires only one parent and the reason that regeneration is a type of asexual reproduction are correct, with regeneration being a clear example of how a single organism can reproduce asexually.
Step-by-step explanation:
The question asks about the nature of asexual reproduction and its mechanisms. To clarify, in asexual reproduction, only one parent is needed to produce a new organism, which means that the offspring are genetically identical to the parent. This involves several mechanisms such as binary fission, budding, fragmentation, and regeneration. The regeneration, as mentioned in the reason, is indeed a type of asexual reproduction as parts of the parent organism can develop into a new individual.
Therefore, the correct answer is: A. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. This is because asexual reproduction does solely involve one parent and regeneration is a type of asexual reproduction whereby new organisms are produced from the fragments of the parent.