Infield Fly and/or Interference

[FleasOf1000Camels]

Runners on 1st and 2nd, 1 out.  Lead runner is stealing.

Batter hits pop fly just left of 2nd, both umpires call and signal "infield fly..."

Both runners are returning, but lead runner bumps into F6 and ball lands untouched.

Who is out?

A.  Batter

B.  Runner

C.  Both 

[Jimurray]

Runners on 1st and 2nd, 1 out.  Lead runner is stealing.

Batter hits pop fly just left of 2nd, both umpires call and signal "infield fly..."

Both runners are returning, but lead runner bumps into F6 and ball lands untouched.

Who is out?

A.  Batter

B.  Runner

C.  Both 

"C" unless somehow the ball ended up foul.

[dookiexman]

C

[smckin]

C

[ricka56]

Not enough info. If F6 is the protected fielder, the answer is C.
If not, the answer is A.