Protein synthesis do happen in ribosomes that usually is found outside of a nucleus. The process of transferring from nucleus to ribosomes would be transcription. RNA is synthesized during transcription. There is still a possibility it can be in the nucleus though.
The answer is C (when they cannot interbreed) because when the new species cannot have offspring with the old species, they do not mix traits.
D. is the answer BTW this should be on chemistry topic not biology