The correct answer is (a).
The Right to Equality is one of the fundamental rights guaranteed by the Indian Constitution. It includes the right to equality before the law, the right to equal protection of the laws, the prohibition of discrimination on grounds of religion, race, caste, sex or place of birth, and the right to equality of opportunity in matters of public employment.
The concentration of wealth is a form of inequality that can lead to discrimination and other forms of injustice. It can also lead to a concentration of power in the hands of a few, which can undermine democracy and the rule of law.
The Right to Equality is therefore violated by the concentration of wealth, as it denies people the equal opportunity to enjoy their fundamental rights.
The other options are incorrect because:
(b) The Directive Principles of State Policy are not fundamental rights, but they are nevertheless fundamental in the governance of the country. They are guidelines for the State to follow in making laws and policies. The concentration of wealth does not violate the Directive Principles of State Policy.
(c) The Right to Freedom is a fundamental right that includes the right to freedom of speech and expression, the right to assemble peaceably and without arms, the right to form associations or unions, the right to move freely throughout the territory of India, the right to reside and settle in any part of the territory of India, and the right to practice any profession, or to carry on any occupation, trade or business. The concentration of wealth does not violate the Right to Freedom.
(d) The Concept of Welfare is a broad concept that encompasses the idea that the State should provide for the welfare of its citizens. The concentration of wealth does not violate the Concept of Welfare.