Introduction:
Among the given options, a bullock cart is the means of transport that uses animal energy. It is a traditional form of transportation that has been used for centuries in various parts of the world, especially in rural areas.

Explanation:
Bullock cart:
A bullock cart is a simple cart or wagon that is pulled by one or more oxen or bullocks. The bullocks are harnessed to the cart using a yoke, and their energy is used to pull the cart forward. This type of transport is commonly used for carrying goods, agricultural produce, and even people in rural areas where modern transportation infrastructure may be limited.

Animal energy:
The term "animal energy" refers to the physical power and strength of animals that can be harnessed to perform various tasks, including transportation. In the case of a bullock cart, the energy of the bullocks is utilized to pull the cart and move it from one place to another.

Advantages of bullock carts:
- Environmentally friendly: Bullock carts do not contribute to pollution as they do not use any fossil fuels or emit harmful gases.
- Sustainable: Since bullocks are animals, their energy can be replenished naturally through proper care and feeding.
- Cost-effective: Bullock carts are relatively inexpensive to operate and maintain compared to motorized vehicles.
- Suitable for rural areas: Bullock carts are well-suited for navigating narrow, unpaved roads or uneven terrain commonly found in rural areas.

Conclusion:
In summary, a bullock cart is a traditional means of transport that utilizes the energy of bullocks to pull a cart. It is a sustainable, cost-effective, and environmentally friendly mode of transportation, particularly in rural areas.