The lower hills of Himachal Pradesh are suitable for growing:

Apples
Subtropical fruits
Wheat and Maize
Rice

The correct answer is: Apples.

The lower hills of Himachal Pradesh are suitable for growing apples because of the following reasons:

  • The climate in the lower hills of Himachal Pradesh is temperate, with cool summers and mild winters. This climate is ideal for growing apples.
  • The soil in the lower hills of Himachal Pradesh is rich in nutrients, which is essential for growing healthy apples.
  • The water in the lower hills of Himachal Pradesh is clean and pure, which is also essential for growing healthy apples.

The other options are not suitable for growing in the lower hills of Himachal Pradesh because of the following reasons:

  • Subtropical fruits require a warmer climate than the lower hills of Himachal Pradesh can provide.
  • Wheat and maize are cereal crops that require a warmer climate than the lower hills of Himachal Pradesh can provide.
  • Rice is a water-intensive crop that requires a warmer climate and more rainfall than the lower hills of Himachal Pradesh can provide.