The correct options are
A They showcase the workmanship of great craftspersons in the country.
B They are a source of ancient history.
C The language used on historical pillars represents ancient history.
D They represent some historical events.
Historical buildings and monuments are a symbol of our ancient culture. The language used on historical pillars represents the ancient history, and they showcase workmanship of great craftsmen of the country. That is why our government spends a lot of money in preserving historical buildings and monuments.