The correct option is C Both (a) and (b)
Sexual reproduction involves 2 parents and so biparental. Sexual reproduction is a form of reproduction where two morphologically distinct types of specialized reproductive cells called gametes fuse together. Uniparental is when an organism develops from one parent like in self-fertilization, which is also considered as a form of sexual reproduction. However, generally when an organism develops from a single parent, it is through means of asexual reproduction. For eg. parthenogenesis.