Algebra-1

The discrete data among the options given is: Number of books on a shelf.

Here’s why:

Discrete data consists of distinct, separate values that are typically whole numbers and countable. The number of books on a shelf is a specific countable quantity. It can only take on specific values like 0, 1, 2, 3, and so on, depending on how many books are actually present on the shelf.

Let's briefly discuss the other options:

B. Amount of rainfall in a day: This is continuous data because rainfall can be measured ...