e) T
After the 12th week of gestation, progesterone can induce dilation and atony of the renal calyses and ureters. With advancing gestation, the enlarging uterus can compress the ureters as they cross the pelvic brim and cause further dilatation by obstructing flow. These changes may contribute to the frequency of urinary tract infections during pregnancy.
[ Ref :
http://www.nda.ox.ac.uk/wfsa/html/u09/u09_005.htm#rena ]