The correct answer is option 4 - 1, 2, and 3.

Norman Borlaug won the Nobel Peace Prize for his contributions in multiple areas.

Option 1 states that he won the prize for the development of high-yielding crops. This is accurate as Borlaug`s work in developing new strains of wheat led to significant increases in crop yields, helping to alleviate hunger and improve food security in many parts of the world.

Option 2 mentions the modernization of irrigation infrastructure, and this is also correct. Borlaug`s work involved not only developing high-yielding crops but also implementing the necessary infrastructure to support their growth. This included improving irrigation methods to increase water efficiency and support the growth of these crops.

Option 3 states that Borlaug won the Nobel Peace Prize for the introduction of synthetic fertilizers and pesticides. This is true as well. Borlaug`s agricultural innovations involved the use of synthetic fertilizers and pesticides to control pests, increase crop productivity, and improve food production.

Therefore, the correct answer is option 4 - 1, 2, and 3, as all three options accurately describe the contributions for which Norman Borlaug won the Nobel Peace Prize.