Which of the Following Statements About Vagal Suppression Is True

Which of the following statements about vagal suppression is true?

A) Vagal suppression is an index of how effectively the vagus nerve modulates heart rate in accordance with breathing.
B) Children who have lower heart rates are said to have high vagal suppression.
C) Children with higher vagal suppression are more likely to exhibit problem behaviors.
D) Vagal suppression is associated with a capacity related to emotion regulation.