The correct answer is option 3: Therapeutics. In Britain, human cloning is permitted for the purpose of therapeutic reasons. This means that it is allowed for medical and scientific research purposes, such as using cloned human cells or tissues to develop new treatments or therapies for various medical conditions. This allows scientists to study and better understand certain diseases and find potential cures or treatments.

Option 1, Reproduction, is not correct as human cloning for the purpose of creating a genetically identical individual is not permitted in Britain. Clone embryos cannot be implanted into a woman`s uterus for reproductive purposes.

Option 2, Research, is partially correct as human cloning is permitted in Britain for research purposes, but the specific aim is therapeutics rather than general research.

Option 4, Genetics, is also not entirely accurate as human cloning in Britain is not solely focused on genetic studies, but rather on advancing therapeutic options through cloning techniques.