Madhavi eats one full bar of chocolate. Then she divides another one into 5 equal parts and eats 3 of those parts. The total number of chocolates that she has eaten is

• A.  \[a+0=a=0+a\]                               
• B.  \[a\times 1=a=1\times a\]
• C.  \[a+(-a)=0=(-a)+a\]                       
• D.  \[a\times \frac{1}{a}=1=\frac{1}{a}\times a\]