In the given code, each alphabet is +4 in sequence.
$AMCF$ can be written as $EQGJ$. its patterns are as follows:
- $A+4=E$
- $M+4=Q$
- $C+4=G$
- $F+4=H$
$NKUF$ is written as $ROYJ$. its patterns are as follows:
- $N+4=4$
- $K+4=O$
- $U+4=Y$
- $F+4=J$
In the same way, $DHLP$ can be written as follows;
- $D+4=H$
- $H+4=L$
- $L+4=P$
- $P+4=T$
Therefore $option(3)$ is correct.