Seats demanded to reserve for women is one-third.

Explanation:
The correct answer is option 'A' - One-Third.

In order to understand why one-third of the seats are demanded to be reserved for women, let's break down the question and analyze it step by step.

1. Understanding the demand:
The question states that a certain number of seats are demanded to be reserved for women. This means that there is a call for a specific percentage of seats to be allocated exclusively for women.

2. Analyzing the options:
a) One-Third
b) One-Fourth
c) One-Fifth
d) Two-Thirds

The options provide different fractions that represent the percentage of seats to be reserved for women. We need to determine which option is the most appropriate.

3. Determining the correct fraction:
To determine the fraction of seats to be reserved for women, we need to consider the principle of gender equality and the aim of providing equal opportunities for both men and women. In this context, it is important to allocate a fair share of seats for women to ensure their representation and participation.

Based on these considerations, the most suitable fraction would be one-third (option 'A'). This means that out of the total number of seats available, one-third should be reserved exclusively for women. This ensures that women have equal opportunities and representation in the given context.

4. Justification for the answer:
Reserving one-third of the seats for women promotes gender equality and provides a fair chance for women to participate and be represented. It helps address any existing gender disparities and ensures that women have an equal voice and presence.

Therefore, the correct answer is option 'A' - One-Third.