**Reciprocal of a Rational Number**

The reciprocal of a rational number is obtained by interchanging the numerator and the denominator. For example, the reciprocal of 3/4 is 4/3.

**Finding the Rational Number that is equal to its Reciprocal**

To find a rational number that is equal to its reciprocal, we need to find a number x such that x = 1/x.

Let's solve this equation to find the value of x:

x = 1/x

Multiplying both sides of the equation by x gives us:

x * x = 1

This equation can be written as:

x^2 = 1

Taking the square root of both sides, we get:

x = ±√1

Simplifying the square root of 1 gives us two possible values for x:

x = ±1

Therefore, the rational number that is equal to its reciprocal is 1.

**Explanation of the Correct Answer (Option B)**

Option B states that the only rational number that is equal to its reciprocal is 1. This is indeed correct because, as we derived earlier, the solution to the equation x = 1/x is x = ±1. Since we are looking for a rational number, the only valid solution is x = 1.

Option A (2), Option C (1/2), and Option D (0) are not correct because these numbers do not satisfy the equation x = 1/x. For example, if we substitute A = 2 in the equation, we get 2 = 1/2, which is not true. Similarly, if we substitute C = 1/2, we get 1/2 = 1/(1/2) = 2, which is also not true.

Therefore, the correct answer is Option B (1), as it is the only rational number that is equal to its reciprocal.

1 because when there is no denominator we consider it to be 1. so in this case the fraction would be 1/1 which is= to its reciprocal.