Pivot once about the circled element in the simplex$$ tableau, and read the solution from the result.

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Part $1$

A$.$

x $1=50,$ s $3=300$; x $2,$ x $3,$ s $1,$ s $2=0$

B$.$

x $1=50,$ z$=100$; x $2,$ x $3,$ s $1,$ s $2,$ s $3=0$

C$.$

x $1=50,$ s $2=200,$ z$=100$; x $2,$ x $3,$ s $1,$ s $3=0$

D$.$

x $1=50,$ s $2=200,$ s $3=300,$ z$=100$; x $2,$ x $3,$ s $1=0$