Which statement best describes the electronegativity of an element?

Which statement best describes the electronegativity of an element?

a. Electronegativity of an atom is it’s ability to lose electrons during cation formation.
b. Electronegativity of an atom is it’s ability to share electrons during a covalent bond formation.
c. Electronegativity of an atom is it’s ability to gain electrons during anion formation.
d. Electronegativity of an atom is it’s ability to produce energy while losing an electron.
e. Electronegativity of an atom is it’s ability to attract electrons during bond formation.