Which of the Following Have Researcher Not Found with Regard

Which of the following have researcher not found with regard to falling in love?

A) People in love are unable to feel romantic love toward anyone but their beloved.
B) Some people in their thirties and forties may have developed normally, even had children, but never have fallen in love.
C) The love-possessed often feel extreme emotions, including exhilaration, euphoria, a pounding heart, or increased energy.
D) The love-possessed often feel a loss of appetite, anxiety, or sleeplessness.