In which of the following regions of the world, the production of citrus fruits is well developed?

1. A

   Monsoon regions

   (a) Monsoon regions. Monsoon lands favour rice, jute, tea—not the classic commercial citrus belt.

2. B

   Tropical high lands regions

   (b) Tropical highlands. Highlands may grow coffee or temperate orchards at altitude; they are not the textbook citrus region.

3. C

   Mediterranean regions

   (c) Mediterranean regions. Citrus (oranges, lemons, mandarins) is a hallmark of Mediterranean summer-dry, winter-rain climates (California, Spain, Italy, Israel, parts of Australia). That is the official key.

4. D

   Equatorial regions

   (d) Equatorial regions. Year-round rain and humidity suit rubber and cocoa, not commercial citrus orchards.

Summary. Official key is (c). Citrus production is well developed in Mediterranean regions. Monsoon, equatorial and tropical-highland belts are not the classic citrus realms.