The correct answer is option 4, which includes all three motives behind Muhammad Bin Tughlaq`s transfer of capital from Delhi to Daulatabad.

The first motive behind the shift to Daulatabad was to establish control over the Deccan and Gujarat regions. By moving the capital to Daulatabad, Tughlaq aimed to exert his authority over these areas and consolidate his power.

The second motive was to have access to the Western and Southern ports. Daulatabad, being strategically located, provided a better connection to the ports in the western and southern regions. This would have facilitated trade and commerce, enabling Tughlaq to expand his economic influence.

The third motive was self-defense. By relocating the capital to Daulatabad, Tughlaq aimed to protect himself from the direct Mongol invasion from the North-Western frontier. Daulatabad`s geographical location made it more secure against potential attacks, providing Tughlaq with a strategic advantage and safeguarding his rule.

So, all three motives - establishing control over Deccan and Gujarat, accessing Western and Southern ports, and protecting from invasion - were reasons behind Muhammad Bin Tughlaq`s transfer of capital from Delhi to Daulatabad.