Introduction:
In power transmission lines, cables are used to transmit electrical energy over long distances. These cables are designed to withstand high voltage and current, and to ensure their reliable operation, inter sheaths are provided. These inter sheaths serve various purposes, including minimizing charging current, minimizing stress, providing uniform stress distribution, and minimizing high voltage. Among these options, the correct answer is option 'C', which states that inter sheaths are provided to provide uniform stress distribution.

Explanation:
Inter sheaths in power transmission line cables are an important component that helps to ensure the reliable and efficient transmission of electrical energy. They provide several benefits, including:

1. Minimize charging current:
Inter sheaths in power transmission line cables help to minimize charging current. When an electric field is applied to a cable, it causes the accumulation of charges on the surface of the cable. This charging current can lead to power losses and affect the overall efficiency of the transmission line. Inter sheaths provide a conducting path for these charges and help to minimize the charging current.

2. Minimize stress:
Inter sheaths also help to minimize stress on the cable. During operation, power transmission lines are subjected to various mechanical and electrical stresses. These stresses can lead to the deformation or damage of the cable insulation, reducing its reliability. Inter sheaths provide an additional layer of protection and help to distribute the stress evenly along the length of the cable, minimizing the chances of insulation failure.

3. Provide uniform stress distribution:
The primary purpose of inter sheaths in power transmission line cables is to provide uniform stress distribution. The electrical and mechanical stresses on the cable can vary along its length, especially at points where the cable is terminated or connected to other equipment. Inter sheaths help to distribute these stresses evenly, ensuring that no particular section of the cable experiences excessive stress. This uniform stress distribution helps to improve the overall reliability and lifespan of the cable.

4. Minimize high voltage:
Inter sheaths also play a role in minimizing high voltage levels in power transmission line cables. High voltage levels can lead to various problems, including insulation breakdown and corona discharge. Inter sheaths provide additional insulation and help to reduce the electric field intensity, thereby minimizing the risk of high voltage-related issues.

Conclusion:
In conclusion, inter sheaths in power transmission line cables serve multiple purposes, including minimizing charging current, minimizing stress, providing uniform stress distribution, and minimizing high voltage. Among these options, the correct answer is option 'C', which states that inter sheaths are provided to provide uniform stress distribution. These inter sheaths are crucial components in ensuring the reliable and efficient transmission of electrical energy over long distances.