Correct statements for the given reaction are:

A. Compound 'B' is aromatic
B. The completion of above reaction is very slow
C. 'A' shows tautomerism
D. The bond lengths of C $$-$$ C in compound B are found to be same
Choose the correct answer from the options given below.

A

B, C and D only

B

A, B and C only

C

A, C and D only

D

A, B and D only