Of the Following,which Is the Least Plausible Reason Why Children

Of the following,which is the least plausible reason why children would be left behind in a sending country when their parents migrate?

A) New LPRs may not have the financial resources necessary for bringing all their children with them when they migrate.
B) By the time a numerically limited visa becomes available,the children may have lost their eligibility for visas (by getting married,for example) .
C) Children who have not seen the hardships of illegality are not equipped for new lives in a foreign country.
D) Some visa categories do not provide visas for the children of new LPRs.