Which of the following is the best explanation for the mechanism of the action of the intrauterine device (IUD)?
Hyperperistalsis of the fallopian tubes accelerates oocyte transpo and prevents feilization A subacute or chronic bacterial endometritis interferes with implantation Premature endometrial sloughing associated with menorrhagia causes early aboion A sterile inflammatory response of the endometrium prevents implantation