A consumer changes the quantities they consume in their bundle while maintaining the same level of satisfaction $($utility$)$ at $40.$ They change the amount of their $($horizontal axis$)$ good X by adding $10$ units, while they change the amount of their $($vertical axis$)$ good Y by reducing it by $5$ units. What is the MRS$?$

$0\mathrm{.}5$

$1$

$2$

$5$