King's Indian Defence, Najdorf Style!

My reading of Zurich 1953 continues! Here's something for my King's Indian homies, a few positions (tactical and strategic) from the KID, and a look at the game below.

 

#1: How should black respond to a4?

a) Nf6

b) a5

c) Rf6

White has played Nb5, how should black respond?

a) Ne8

b) h5

c) g4

Is it safe for white to play gxh3?

White has just moved his dark squared bishop to e3, what's black's strongest reply?

a) Rg7

b) Qh4

c) Nxg2

d) Bh6

What's the quickest way to finish white off?