$a,b \to odd$
$c \to even$
if we take difference of a odd and a even then we get odd number for example 2-5=3
if we take square of odd number then we get odd numer for example $3^{2}$=9
if we multiply a odd and even then we will get a even for example 9* 2=18
if we multiply a odd and odd then we will get a even for example 9*3=27
for the given problem let say a=3, b=5, c=6
$\left ( a \right )\left ( 3-6 \right )^{2}\left ( 5-3 \right )=18\rightarrow even$
$\left ( b \right )\left ( 3-6 \right )^{2}\left ( 5 \right )=45\rightarrow odd$
$\left ( c \right )\left ( 3-6 \right )\left ( 5-6 \right )=3\rightarrow odd$
$\left ( d \right )\left ( 3-5 \right )^{2}\left ( 6 \right )=24\rightarrow even$
all options are correct
