Which of the Following Statements Is FALSE Regarding Ras Mutations

Which of the following statements is FALSE regarding Ras mutations in cancer patients?

A) Mutations often occur at codons 12,13,or 61.
B) Oncogenic mutations usually result in higher levels of GDP-bound Ras.
C) Oncogenic mutations usually result in higher levels of GTP-bound Ras.
D) Cells often have compromised activity of GTPase-activating proteins GAPs) .
E) None of the above.