Max $51+32+63$ subject to $(x1+22+2312),$

$(21+32+2320)$ with nonnegativity, what is the

impact on the current optimal objective if one additinal

unit of $x2$ is produced?

a$.$ Increased by $5$

b$.$ Decreased by $-5$

c$.$ Unchanged

d$.$ Decreased by $5$

Clear my choice