Read the given statements and select the correct option.
i. IVF is a treatment for infertility when a woman is able to produce ovum however, problems of the fallopian tube make fertilisation difficult.
ii. Asexual reproduction is a rapid and easier method of multiplication.
iii. Unicelled organisms reproducing by binary fission are referred to as 'immortals' because actual death of the parent does not occur under normal conditions.
iv. Metamorphosis is the transformation of an adult animal to larval form.