Which of the following factors can contribute to greater resistance in conductors?

The correct answer highlights that increased load on the system can lead to greater resistance in conductors. When the system load increases, the amount of current flowing through the conductors also increases. According to Ohm's Law, resistance is a factor that affects how much current can flow for a given voltage. As current increases due to a higher load, the conductors may experience an increase in temperature, which can further affect their resistance characteristics. Additionally, increased load can lead to voltage drops across the conductors, effectively suggesting that a system under higher load will be less efficient and might experience greater resistance effects.

In contrast, shorter conductor lengths, larger conductor sizes, and lower ambient temperatures generally contribute to lower resistance. Shorter lengths and larger sizes of conductors reduce resistance due to the physical properties of the material, while lower ambient temperatures help to maintain those properties by minimizing thermal effects that can increase resistance.