The Mutant Huntingtin Protein That Results in Huntington Disease

The mutant huntingtin protein that results in Huntington disease

A) causes a decrease in production of another protein.
B) leads to degeneration of cells in the brain's striatum.
C) is toxic to brain cells.
D) leads to degeneration of cells in the brain's striatum and is toxic to brain cells only.
E) has all of these traits.