Explanation:

Absolutely, let's break it down:

- The primary sector covers raw materials—think farming, mining, fishing. It's all about getting stuff straight from nature.

- The secondary sector is where things get made. Factories, manufacturing plants, workshops—this is all about turning raw materials into usable products.

- The tertiary sector? That's all about services—selling, support, transport, healthcare, retail, and so on. Basically, it’s what happens after things are made.

- If you picked "none of the above," you might want to double-check—these sectors cover pretty much everything.

Factory and production/manufacture industries clearly sit in the secondary sector.