Let's observe one by one
#chain isomerism
- Chain isomerism means the double or triple are placed at different positions although the compound is same.
No all chains are equal here ,hence no chain isomerism.
#Functional isomerism
- If different functions are found then it's functional isomerism.
No there is Ketone(C=O) ,Amine(NH2) and Alcohol present at both .
#Geometrical isomerism .
Yes see the darkened section of amine in second compound .
It's geometric isomerism.
Option C is correct