Question

What do you understand by the term 'defection'?

• A. Change of party allegiance from the party on which a person got elected to a legislation body to a different party
• B. Change of the preference of the voters
• C. Internal politics of Party
• D. Change of the party before election

Answer 1

The correct option is A Change of party allegiance from the party on which a person got elected to a legislation body to a different party

A defector is basically a person in politics who gives up his own political party and join other alliance for benefit. This term is also applied, often pejoratively, to anyone who switches loyalty to another religion, sports team, political party, or other rival faction. In that sense, the defector is often considered a traitor by his original side.
Hence, option $A$ is the correct answer.