Determine If the Relation Illustrated Is a Function $Alice~\longrightarrow ~snake\\Brad~\longrightarrow ~cat\\Carl$

Determine if the relation illustrated is a function. Give the domain and range of the function or relation.
-pets at home $Alice~\longrightarrow ~snake\\Brad~\longrightarrow ~cat\\Carl$ dog

A) not a function
B) function domain: {Alice, Brad, Carl} domain: {snake, cat, dog}
Range: {snake, cat, dog} range: {Alice, Brad, Carl}
C) function
D) not a function domain: {Alice, Brad, Carl} domain: {snake, cat, dog}
Range: {snake, cat, dog} range: {Alice, Brad, Carl}