Please submit your concern

Explanation:

“There is now considerable evidence that Type B malnutrition is a major cause of chronic degenerative diseases (paragraph 4, first sentence).”
Option 2 is the correct reason for why Type B malnutrition is a major contributor to illness (chronic degenerative diseases) and subsequent death. If developing countries suffer from one type of malnutrition, it does not apply that developed countries would suffer from another type (option 1).
Option 3 is not correct. It has been explicitly stated in paragraph 4 that therapeutic medicines have been developed by the pharmaceutical companies.
Whether national surveys include the newer nutrient groups or not has not been stated in the passage (option 4).
Hence, the correct answer is option 2.