At Tet, my mother and her friends often go to the hospitals. They go there to donate gifts to the sick children.

A. At Tet, my mother and her friends often go to the hospitals, so they donate gifts to the sick children.

B. At Tet, my mother and her friends often go to the hospitals in case they donate gifts to the sick children.

C. At Tet, my mother and her friends often go to the hospitals providing that they donate gifts to the sick children.

D. At Tet, my mother and her friends often go to the hospitals to donate gifts to the sick children.