Boron is to the immediate left of carbon in the same row in the periodic table. Which of the following statements compares the radius and pull exerted by the protons of boron and carbon atoms?
a Boron has a smaller radius and the protons in carbon exert a greater pull.
b Boron has a larger radius and the protons in carbon exert a greater pull.
c Boron has a smaller radius and the protons in carbon exert less pull.
d Boron has a larger radius and the protons in carbon exert less pull.