Option c is the correct answer. Good Friday of Christians is celebrated because it is the day of Jesus Christ's crucifixion. Good Friday is a Christian holiday that commemorates the crucifixion of Jesus and his death at Calvary, as described in the New Testament. It is observed during Holy Week as part of the Paschal Triduum, which also includes Maundy Thursday and Holy Saturday. It is a day of sorrow, penance, and fasting for Christians, who remember the suffering and sacrifice of Jesus for the salvation of humanity