You Are Reading the Chapter of Your Textbook That Covers

You are reading the chapter of your textbook that covers mental retardation, and you come to a discussion of rubella, human immunodeficiency virus, syphilis, and encephalitis. They are all included in the same section of this chapter because they are all

A) caused by recessive gene pairings.
B) infectious diseases that can cause mental retardation.
C) the most common forms of death for people with severe and profound mental retardation.
D) the result of per-natal and peri-natal complications.