Let's solve figure by figure
Figure A 
This figure has a total of 5 sides, therefore it is a pentagon.
Figure B 
This figure has a total of 8 sides, therefore it is an octagon.
Figure C 
This figure has a total of 3 sides, therefore it is a triangle. 
According to the answer table, it would be 
Pentagon: Figure A 
Octagon: Figure B 
Hexagon: None