What is the main idea of this passage?

Responses
A Pet cloning is a scientific process without any drawbacks and that should be permitted for all pet owners.Pet cloning is a scientific process without any drawbacks and that should be permitted for all pet owners.
B Pet cloning is an abomination of science and a disaster waiting to happen; it should not be allowed.Pet cloning is an abomination of science and a disaster waiting to happen; it should not be allowed.
C There have been many stories of successful pet clones that have ended happily for both the family and the pet clone.There have been many stories of successful pet clones that have ended happily for both the family and the pet clone.
D Animal rescue organizations have long been opposed to pet cloning because of the large number of unowned pets that already exist.Animal rescue organizations have long been opposed to pet cloning because of the large number of unowned pets that already exist.

D Animal rescue organizations have long been opposed to pet cloning because of the large number of unowned pets that already exist.

The main idea of this passage is D: Animal rescue organizations have long been opposed to pet cloning because of the large number of unowned pets that already exist.