Under what conditions will the following code jump to the label $L1?$

movf $x,W$

subwf $y,$ W

btfss STATUS, Z

goto END$1$

btfss STATUS, C

goto L$1$

END$1$:

Select one:

a$.xy$

b$.xy$ and $C=1$

c$.x=y$ and $C=0$

d$.x=y$ and $C=1$

e$.xy$ and $C=0$