Which of the Following Statements Is True

Which of the following statements is true?

A) The atomic radius is the distance between two covalently bonded atoms of the same element.
B) The atomic radius is half the distance between two covalently bonded atoms of the same element.
C) The atomic radius is the distance between two covalently bonded atoms of different elements.
D) The atomic radius is half the distance between two covalently bonded atoms of different elements.
E) The atomic radius is the distance between two ionically bonded atoms of the same element.