Statement 'a' is correct: A citizen enjoys all the civil rights in the State. While civil rights (like freedom of speech, religion, equality before law, personal liberty) are available to citizens, they are subject to reasonable restrictions defined by law. However, in the context of comparing with aliens, citizens enjoy the full range of civil rights applicable within the state. Statement 'b' is correct: A citizen enjoys all the political rights in the State. Political rights (like the right to vote, right to contest elections, right to hold public office) are fundamental rights available exclusively to citizens. Statement 'c' is incorrect: An alien does not enjoy all the civil rights in the State. While aliens are entitled to many civil rights (such as the right to life and personal liberty under Article 21, equality before the law under Article 14), certain fundamental rights are specifically available only to citizens. These include rights under Article 15 (prohibition of discrimination on grounds of religion, race, caste, sex or place of birth), Article 16 (equality of opportunity in matters of public employment), Article 19 (protection of certain rights regarding freedom of speech, assembly, association, movement, residence, and profession), Article 29 (protection of interests of minorities). Statement 'd' is incorrect: An alien does not enjoy any political rights in the State. Political rights, such as the right to vote or hold public office, are reserved for citizens.