Combine like terms. \( 2 \mathrm{~m}+(-6 \mathrm{~m}) \) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The expression can be simplified. The simplified version is B. The expression cannot be simplified.

To simplify the expression \( 2 \mathrm{~m} + (-6 \mathrm{~m}) \), we combine the coefficients of the like terms. So, \( 2 + (-6) = -4 \). Therefore, the simplified expression is \(-4m\). A. The expression can be simplified. The simplified version is \(-4m\).