Final answer:
Rubella is a member of the Togavirus family and is known for causing mild viral diseases like German measles.
Step-by-step explanation:
Rubella belongs to the Togavirus family, which makes answer A correct. It is an enveloped RNA virus that is primarily transmitted through aerosols produced by coughing or sneezing. Rubella, also known as German measles, is typically a relatively mild viral disease characterized by a rash and low fever. Infection can be more severe if it occurs during pregnancy as it can lead to serious birth defects.