The correct answer is - True.
Prior to the Mughal invasion, India was divided into multiple smaller Muslim and Hindu kingdoms. They were in constant conflict with one another, and also were not any significant force individually.
The Mughals used this circumstances. They moved south from the Central Asia steppes, and by using the typical Mongol horde-style of warfare managed to defeat these small kingdoms with relative ease. Once they did that, they had under their control most of the northern half of India, and remained in the region for several centuries.