The order of size of nucleus and Bohr radius of an atom respectively are:

• A. 10 − 14 m , 10 − 10 m
• B. 10 − 10 m , 10 − 8 m
• C. 10 − 20 m , 10 − 16 m
• D. D 10 − 8 m , 10 − 6 m