An industry is
A. A group of firms producing differentiated products
B. A group of firms producing distinct commodities
C. A group of firms producing related goods
D. A group of firms producing unrelated goods

Seriously...
What do YOU think??
While we're happy to help we will NOT do all the work for you..

E. 42, the Answer to life, the Universe and everything. Citation... "The hitchhikers guide to the Galaxy" by Douglas Adams.

Absolutely!