The answer has A and D as the options, you can check for c by drawing all the reasonance hybrids.
B is more theoretical based.
If you didnt understand feel free to contact me.
Sir how to check option C by resonating stuctures?
draw all resonating structures.
check the percentage of type of bonds appearing.
Then simply apply formula sigma(number of resonating structures with thtat bond length * bond length )/total number of resonating structures