Select the grammatically correct sentence.
A. Today is sixth day of our workshop. All the participants are highly enthusiastic.
B. Today is a sixth day of our workshop. All the participants are highly enthusiastic.
C. Today is the sixth day of our workshop. All the participants are highly enthusiastic.
D. Today is sixth day of our workshop. All participants are highly enthusiastic.

A

D

B

C

C

B

D

A