The correct answer is: A. 11 December
World Day of the Sick is an observance day instituted by Pope John Paul II in 1992. It is celebrated on the Feast of Our Lady of Lourdes, which is on 11 December. The day is a time to pray for the sick and to show solidarity with them. It is also a time to raise awareness of the needs of the sick and to promote their care.
Option B, 11 February, is the Feast of Our Lady of Lourdes. This is a day when Catholics celebrate the apparition of the Virgin Mary to Saint Bernadette Soubirous in Lourdes, France.
Option C, 25 September, is the Feast of Our Lady of Sorrows. This is a day when Catholics commemorate the sorrows that Mary experienced in her life, including the crucifixion of Jesus.
Option D, 9 August, is the Feast of the Transfiguration of the Lord. This is a day when Catholics celebrate the transfiguration of Jesus on Mount Tabor.