Which Article of the Indian Constitution mentions that, where the same person is appointed as the Governor of two or more states, the emoluments and allowances payable to him/her shall be allocated among those states?

The correct answer is Article 158.

Detailed Explanation:
1. Provision under Article 158:
Article 158 of the Constitution of India deals with the Conditions of Governor's Office. Specifically, Clause (3A) of Article 158 states that where the same person is appointed as the Governor of two or more states, the emoluments and allowances payable to the Governor shall be allocated among those states in such proportion as the President may by order determine. This clause was inserted by the 7th Constitutional Amendment Act, 1956.

2. Overview of Other Options:
• Article 155: Relates to the appointment of the Governor by the President of India.
• Article 157: Specifies the qualifications required for appointment as a Governor (such as being a citizen of India and having completed 35 years of age).
• Article 160: Provisions for the discharge of the functions of the Governor in certain unforeseen contingencies.