The correct answer is option 4: Vikram.

Option 1: Vigyan is not the name given to the lander of Chandrayaan-2. It might be referring to the scientific objectives or experiments carried out by the mission.

Option 2: Anusandhan is not the name given to the lander of Chandrayaan-2. It means `research` in Hindi, but it is not specifically related to the name of the lander.

Option 3: Pragyan is not the name given to the lander of Chandrayaan-2. Pragyan is actually the name of the rover that was carried by the lander. The rover`s purpose was to explore the lunar surface and perform experiments.

Option 4: Vikram is the correct name given to the lander of Chandrayaan-2. It was named after Vikram Sarabhai, who is often regarded as the father of the Indian space program. The lander`s primary objective was to make a soft landing near the lunar south pole and conduct various experiments.

Overall, option 4 is the correct answer as Vikram is the name of the lander in the Chandrayaan-2 mission.