Why Is the Production of Transgenic Plants Somewhat Easier Than

Why is the production of transgenic plants somewhat easier than the production of transgenic animals?

A) plant cells lack cell walls,so uptake of DNA is easier than in animal cells
B) plant cells are more stable than animal cells
C) plant cells are totipotent
D) plant cells are more highly evolved as they contain both chloroplasts and mitochondria
E) all of the above are reasons why plant cells are more easily transformed than animal cells