In a democratic country, like India, all adults irrespective of _____ are allowed to vote.
A)Religion
B)Education they have
C)Caste, or whether they are rich or poor
D)All of these

Hint: It is included in the Citizenship Act, which states all the rights that an Indian citizen shall enjoy.
These rights of the Citizenship Act are protected under the 15th amendment of the Indian Constitution.

Complete answer:
All adults irrespective of religion, education, caste or their financial status are allowed to vote. This right to vote is provided to every Indian citizen under the Citizenship act. This act includes all the rights that the Indian citizen enjoys (the right to vote being one of them).
According to the Election Commission of India (ECI) every adult, i.e. anyone above the age of 18 is eligible to vote (unless he/she is disqualified by the Government of India). This is the only criteria that the act states. It does not mention any caste, religion, gender, education etc.

The citizens that are eligible to vote can enroll themselves as voters. The Election Commission issues a voter’s slip which confirms the inclusion of the citizen’s name on the voter’s list. The slip along with the Voter ID card is recognized by the ECI at the time of voting. The voter may or may not be having the slip at the time of voting, hence it is available online and at helping booths. By the original Voter ID card is a must and has to be carried at the time of voting.

Hence, the correct answer is option (D)

Note: 1)Clearly, a person who is not an Indian citizen cannot be registered in the voters list and is ineligible.
2)Also, a person who is declared by the law as unstable to vote cannot be enrolled on the list.
3)A person who is barred, due to malpractices or any other illegal acts regarding the electoral process cannot be entitled to be a voter.