I am against cloning, of humans, animals or plants. I am against any type of genetic engineering. Why? Because we just don't know enough about what the ramifications will be down the line. I want to know if the food I buy has been genetically altered. Because then I would not buy it. We don't yet know enough about the consequences of such meddling.
I'm not sure where I stand on artificial insemination. I know that it does help many couples to conceive and have a child, but is it right?? I don't know.
As for c-section, as has been said, this has nothing to do with the other two.
It is a medical technique, not all that new. It doesn't "create" anything artificially, it is only a procedure that helps a baby (already created) to be born, most times saving the baby's and the mother's lives.