• it increases the irreversibility by adding the liquid with higher energy content to the steam generator
• Bheat is exchanged between the expanding fluid in the turbine and the compressed fluid before heat addition
• Cthe principle is similar to the principle of the Stirling gas cycle
• Dit is practically implemented by providing feed water heaters

Regeneration actually DECREASES irreversibility — by preheating feedwater with extracted steam it reduces the temperature difference during heat addition in the boiler, improving cycle efficiency. So the statement claiming it increases irreversibility is the incorrect one.