Reheating in a gas turbine is a technique used to improve the overall efficiency of the turbine system. It involves the process of adding additional heat energy to the gas flow after the initial expansion in the first turbine stage, but before it enters the second turbine stage. This additional heat energy is typically supplied by a supplementary burner or by extracting heat from the exhaust gases.

The correct answer to the question is option 'C', which states that reheating in a gas turbine increases the turbine work. Let's explore why this is the case:

1. Introduction to reheating:
- Reheating is a process that increases the temperature of the gas flow before it enters the next turbine stage.
- The reheating process allows for additional expansion of the gas in the second turbine stage, leading to increased turbine work.
- The reheating process can be done through the use of a supplementary burner or by extracting heat from the exhaust gases.

2. Impact on turbine work:
- Reheating increases the temperature and pressure of the gas flow before it enters the second turbine stage.
- This increased temperature and pressure result in a higher enthalpy of the gas flow, which in turn leads to an increase in the turbine work output.
- The additional expansion of the gas in the second turbine stage increases the energy extracted from the gas and therefore increases the turbine work.

3. Impact on compressor work:
- While reheating increases the turbine work, it does not directly affect the compressor work.
- The compressor work is primarily determined by the pressure ratio across the compressor, which is independent of the reheating process.
- However, the increase in turbine work due to reheating can be used to drive additional compressor stages, which can indirectly increase the compressor work. This is known as intercooling and is a different technique than reheating.

In conclusion, reheating in a gas turbine increases the turbine work by allowing for additional expansion of the gas in the second turbine stage. This increase in turbine work leads to improved overall efficiency of the gas turbine system.