Given the Three Statements Below, Which Choice Is Correct

Given the three statements below, which choice is correct?
I. The principal force holding a crystal of NaCl together is electrostatic (an attraction of positive and negative charges) in nature.
II. The Lewis symbol of sulfur is
III. The Lewis symbol of carbon is

A) only I is true
B) II and III are true, I is false
C) all three are true
D) all three are false
E) none of these answers are correct