Let's simplify the given fractions.
A.) 4/12 ; Simplified value = 1/3
[tex]\frac{4}{12}\text{ = }\frac{\frac{4}{4}}{\frac{12}{4}}\text{ = }\frac{1}{3}[/tex]B.) 0/8 ; Simplified value = 0
[tex]\frac{0}{12}\text{ = 0}[/tex]C.) 16/0 ; Undefined.
[tex]\text{ A fraction with a denominator of zero (0) is undefined.}[/tex]