The given question asks to arrange the cities in descending order according to the Degree of Urbanization definitions in 2025, based on their population.

To determine the correct order, it is essential to consider population estimates and urbanization forecasts for these cities in 2025.

• Jakarta: As of 2025 estimates, Jakarta is expected to be one of the most populated cities globally, with a significant degree of urbanization due to population density in the metropolitan area.
• Dhaka: Dhaka's population is projected to be very high due to rapid urbanization and population growth rates, making it one of the top cities in terms of population size.
• Tokyo: Traditionally the most populous city in the world, Tokyo's population growth is slowing, but it remains tremendously high, maintaining a top position due to its extensive urban area.
• New Delhi: With continuously increasing urban migration and population density, New Delhi is also expected to be amongst the largest cities in terms of population by 2025.
• Manila: As an immensely dense urban area with significant growth dynamics, Manila is expected to maintain a substantial population, though not as high as the others listed.

Based on these considerations, the correct descending order of cities by population in 2025 is:

1. Jakarta
2. Dhaka
3. Tokyo
4. New Delhi
5. Manila

Hence, the correct answer option provided in the question is:

Jakarta, Dhaka, Tokyo, New Delhi, Manila