D) None of these
we can see they just reversed first 4 and last 4 letters and incremented middle letter
$\underline{PLAC}E\underline{MENT}\\ \underline{CALP}F\underline{TNEM}$
so answer sholud be:
$ \underline{CONF} I \underline{DENT}\\ \underline{FNOC} \mathbf{J} \underline{TNED}$