Which process connects glycolysis and the citric acid cycle?

lactic acid formation
acetyl CoA formation
electron transport
Krebs cycle

The process that connects glycolysis and the citric acid cycle is acetyl CoA formation.

The process that connects glycolysis and the citric acid cycle is the formation of acetyl CoA. After glycolysis, the end product, pyruvate, enters the mitochondria where it is converted to acetyl CoA. Acetyl CoA then enters the citric acid cycle (also known as the Krebs cycle) where it undergoes further oxidation to produce energy-rich molecules such as NADH and FADH2.