Fish farming has become the fastest growing sect

【問題】
Fish farming has become the fastest growing sector of the world food economy, with __________ increasing by 11 per cent a year.

【選択肢】
1.　product
http://jibun.atmarkit.co.jp/scenter/ittrain/93_20060602_a1.html

2.　productive
http://jibun.atmarkit.co.jp/scenter/ittrain/93_20060602_a2.html

3.　production
http://jibun.atmarkit.co.jp/scenter/ittrain/93_20060602_a3.html

4.　productively
http://jibun.atmarkit.co.jp/scenter/ittrain/93_20060602_a4.html

問題提供：リアル・イングリッシュ・ブロードバンド株式会社
http://jibun.atmarkit.co.jp/misc/ct.php?id=TR56_RE1
No.09320060602