Correct. Divide each term in the polynomial by the monomial.

$\displaystyle\frac{{{48}{{m}}^{{4}}}}{{{8}{{m}}^{{2}}}}-\frac{{{16}{{m}}^{{3}}}}{{{8}{{m}}^{{2}}}}+\frac{{{12}{m}}}{{{8}{{m}}^{{2}}}}={6}{{m}}^{{2}}-{2}{m}+\frac{{3}}{{{2}{m}}}\usepackage{cmbright}\Huge\$

So 3 is the correct answer.