Graph the Linear Function and Give the Domain and the Range

Multiple Choice

Graph the linear function and give the domain and the range. If the function is a constant function, identify it as such.
- $h(x) =3 x$

A) $\mathrm { D } = ( - \infty , \infty ) , \mathrm { R } = ( - \infty , \infty )$

B) $\mathrm { D } = ( - \infty , \infty ) , \mathrm { R } = ( - \infty , \infty )$

C) $D = ( - \infty , \infty ) , R = ( - \infty , \infty )$

D) $\mathrm { D } = ( - \infty , \infty ) , \mathrm { R } = ( - \infty , \infty )$