Những sai lầm thường mắc khi phát cầu thuận tay

answer; i believe that the correct answer is (a) restriction);

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.  

the answer is false, i know this answer is late but its for anyone else that needs it.