The correct answer is: A. insitu conservation.
In situ conservation is the protection of an endangered species or ecosystem in its natural habitat. This can be done through a variety of methods, such as establishing protected areas, managing human activities, and educating the public about the importance of conservation.
Ex situ conservation is the protection of an endangered species or ecosystem outside of its natural habitat. This can be done through a variety of methods, such as captive breeding, seed banks, and gene banks.
In vivo conservation is the conservation of living organisms. This can be done through a variety of methods, such as captive breeding, seed banks, and gene banks.
Ex vivo conservation is the conservation of non-living organisms. This can be done through a variety of methods, such as DNA storage, tissue culture, and organ preservation.
In situ conservation is the most effective way to protect an endangered species or ecosystem because it allows the species or ecosystem to continue to evolve and adapt to its environment. Ex situ conservation can be a valuable tool for conserving species or ecosystems that are at risk of extinction, but it is not a substitute for in situ conservation.