Diving over a fielder

[ljdave]

I missed the following question on my state test:

R1, one out. R1 is stealing on the pitch. B3 hits a line drive to F3's right. F3 dives and catches the ball for the 2nd out. While F3 is lying on the ground, R1 dives over F3's prone body and gets back to first base before F3 is able to tag either R1 or the base.

a. R1 is guilty of interference.
b. R1 is out for diving over F3.
c. F3 is guilty of obstruction and R1 is awarded second base.
d. Legal play.

I said (b), the state says its (d).

Rule 8-4-2-b-2: "Jumping, hurdling, and leaping are all legal attempts to avoid a fielder as long as the fielder is lying on the ground. Diving over a fielder is illegal."

What am I missing? Thanks for your input.