The correct answer is option 3, Tunisia. Tunisia is the country that initiated the process of the Fourth Wave of Democratic transition.

Option 1, Libya, is not the correct answer. Although Libya experienced political changes during the Arab Spring in 2011, it did not initiate the Fourth Wave of Democratic transition.

Option 2, Afghanistan, is also not the correct answer. Afghanistan did undergo a democratic transition after the fall of the Taliban regime in 2001, but it is not considered to be the initiator of the Fourth Wave.

Option 4, Morocco, is also not the correct answer. Morocco went through political reforms and constitutional changes but was not the instigator of the Fourth Wave.

Therefore, the correct answer is option 3, Tunisia. Tunisia is celebrated as the birthplace of the Arab Spring and played a pivotal role in the Fourth Wave of Democratic transition by inspiring and influencing other countries in the region to pursue democratic reforms.