Identify the correct statement

a) Electron affinity and electron gain enthalpy of an atom of element have the same magnitude.

b) Electron affinity and electron gain enthalpy have opposite sign.

c) Electron affinity and electron gain enthalpy have the same sign.

d) both have different values.

Most probably the answer is the option (d)..Electron affinity of an atom of an element is its tendency or attraction to accept electron to become stable,whereas electron gain enthalpy is not a natural tendency..The later one forms ion whereas the former does not..The later one is a reaction phenomenon but the former one is an intensive property.