This word consists of kanji with hiragana attached, so you can bet it uses the kun'yomi reading. You didn't learn this reading with the kanji, so here's a mnemonic to help you:
You're at a baseball game watching people throw balls around. But you're hungry so you call for a snack from a vendor. You raise your hand and they throw some nachos (な) at you. Oh no! Oh ouch! The nachos are hot and they hit you in the face. The vendor just threw a bunch of hot, sauced nachos at you! WHY?!
This new ball is very easy to throw.
Why are those people throwing dried soy beans?
The pitcher threw the ball and it struck a pigeon flying in front of the batter.