legal guarding position

[Dbyb]

I see this situation all the time in games and would like to know how other refs handle it. Offensive player A-1 is driving the lane with the ball. There are two defensive players side by side in the lane who have established a legal guarding position on the driving player. There is less than 3 feet between the two defensive players. A-1 drives between the two players and gets his head and shoulders past them but then there's contact with the lower body and all three players go sprawling. 4-7-2 (b) seems to indicate it's a block because A-1 had his head and shoulders past the defensive player(s). 4-7-2(c) seems to indicate that it should be PC becasue there was less than 3 feet of space therefore the dribbler has the greater responsibility. Thoughts?