The correct options are
B It marks the beginning of the solar year.
C Guru Gobind Singh founded the Khalsa Panth on this day.
D The state of Punjab marks a state-wide holiday to celebrate this festival.
The festival of Baisakhi is one of the most important festivals for the Sikh community. It is celebrated on the 13th or 14th of April every year. On this day, the farmers of Punjab offer their prayers and thanks to the gods for the bountiful harvest of Rabi crops. Also, on this day, the tenth Guru of Sikhism, Guru Gobind Singh laid the foundation of the Khalsa Panth, which was a brotherhood of saint soldiers to fight against tyranny and oppression.