Answer:
In a soccer match, if a back pass or throw-in is made to the goalkeeper, this restricts the goalkeeper to using only their legs or other body parts—hands are off-limits for playing the ball.
If the goalkeeper uses their hands to touch the ball, the referee will call a foul and award an indirect free kick to the opposing team at the location where the handling occurred.
Considering the entire context, the most suitable answer would be:
an inducement to marriage
This reflects Jonathan Swift’s satirical suggestion to use infants as a means to encourage marriage; he cleverly utilized situational irony to highlight how extreme decisions can be perceived humorously by the audience.