Folk singer Woody Guthrie died of Huntington's disease, an autosomal dominant disorder. Which statement below must be true? a. His daughters will die of Huntington's disease but not his sons. b. His sons will develop Huntington's disease but not his daughters. c. It is very likely that at least one of Woody Guthrie's parents also had the allele for Huntington's disease. d. All of his children will develop Huntington's disease. e. There is not enough information to answer the question.