Regarding Handedness, Which of the Following Statements Is FALSE

Regarding handedness, which of the following statements is FALSE?

A) Left-handed locomotive engineers have higher accident rates with a possible cause being that locomotive controls are designed for right-handed persons.
B) People who owe their left-handedness to a birth trauma have a higher incidence of allergies and learning disorders.
C) Consistent left-handers are more at risk for immune-related diseases than those people with mixed handedness.
D) The shortage of very old lefties may reflect that more left-handed children were forced to become right-handed, so the lefties are masquerading as righties.