Answer
$\bf {Graph(c)}$
Work Step by Step
Since, we have $x=t,y=1-t, z=0$
Thus, $x+y=1$ and $z=0$
This shows a line segment joining $(1,0,0),(0,1,0)$ and so, the x and y intercepts are both $1$.
Hence, the required answer is $\bf {Graph(c)}$