When Creating Transgenic Organisms, One Major Difference Between Plants and Animals

When creating transgenic organisms, one major difference between plants and animals is that

A) only embryos can be used to create transgenic animals, while any plant cell can be used for transgenic plants.
B) only eggs can be used to create transgenic animals, while embryos can be used for transgenic plants.
C) only eggs can be used to create transgenic animals, while any plant cell can be used for transgenic plants.
D) only embryos can be used to create transgenic animals, while eggs must be used to create transgenic plants.
E) any cell may be used to create transgenic animals, while embryos can be used for transgenic plants.