What could potentially occur if microbial growth goes unchecked in a jet fuel tank?

Microbial growth in a jet fuel tank can lead to significant issues, particularly in fuel flow. When microbes grow, they can form a layer of sludge or biofilm that can clog fuel filters and strainers, which ultimately impedes the flow of fuel to the engine. This can cause issues with fuel delivery, potentially leading to engine performance problems or even engine failure due to fuel starvation. Proper maintenance and testing for microbial contamination in fuel tanks are crucial to prevent these complications and ensure reliable aircraft operation. As a result, interference with fuel flow directly correlates with the problems caused by unchecked microbial growth, making it the correct answer.