How to pronounce“b’s”in English

“And there was a time when women were told to go to college not for a B.A. or a B.S. but for an “MRS. Degree,” with the expectation of walking right off the graduation stage and down the aisle.”

“Researchers embarked on a novel study intent on measuring what a Princeton philosophy professor contends is one of the most salient features of our culture — the ability to play the expert without being one. / Or, as the social scientists put it, to BS.”