Associate Professor Polin Strawn, a sociologist at the National University of Singapore, conducted a survey of local married and divorced people and found that couples who have been in love for a long time have a lower chance of breaking up after marriage than those who have been in love for a shorter time. So someone came to the conclusion that in order to have a stronger marriage in the future, it must be extended. Which of the following is true that would most weaken the above conclusion? ['The longer the relationship, the less likely they will get married.', 'It is more important for a couple to get to know each other more deeply during a love period than how long they have been in love.', '"Instant love at first sight" crash marriage is easily broken.', 'People who have been in love for a long time often forget that the purpose of love is marriage.']