The NCAA Presidents' Commission has agreed to explore the questions of freshman eligibility, length of seasons, reduction of athletic costs and what a grant-in-aid should cover.

Division I members of the commission asked their chairman, Chancellor I. M. Heyman of Cal-Berkeley, to develop for the October meeting a set of options that would reduce the institutional costs for athletic programs. That might include a reduction in the number of grants-in-aid that could be offered and a reduction in the size of coaching staffs.

Members also asked the commission chairman, Chancellor John Slaughter of Maryland, to develop a document to review the issue of whether freshmen should continue to be eligible in Division I football and men's and women's basketball . . . .

Memphis State University officials have blocked payment of a bonus to basketball Coach Dana Kirk because of a federal grand jury investigation involving Kirk. "Since the grand jury publicity, a decision was made to postpone the payment until the grand jury is completed," said Charles Holmes, Memphis State's director of community relations. "The assistant coaches have been paid, but Coach Kirk has not at this point."

Holmes said the bonus, amounting to 25 percent of Kirk's $62,500 annual salary, was to reward the coach for taking the basketball team to the semifinals of the NCAA tournament last year . . . .

Stanford Coach Tom Davis, 47, has signed a five-year contract to become basketball coach at the University of Iowa. Davis, whose Stanford teams have compiled a 58-59 record in four years, will replace George Raveling, who left after his third season to coach at Southern Cal. Davis has previously coached at Boston College and Lafayette University as well as been an assistant for two years at American University . . . .

A 17-year-old Tiffin (Ohio) University freshman died Saturday after a freak accident during warm-ups for a baseball game. A baseball thrown by the catcher struck and killed Scot Clarke, the team's shortstop, who apparently did not see it coming. Clarke, of Wooster, Ohio, collapsed after the ball hit him in the middle of the chest.