Correct option is A
Option
(a) 2, 3, 1, 4 is the correct order of the given sentences.
Explanation (why this order is correct):
•
2 must come first because it introduces and defines
food processing.
•
3 logically follows because “These methods” clearly refers to the methods mentioned in sentence 2 and gives examples (simple to complex).
•
1 comes next because it explains one major benefit of the process—
food safety and prevention of contamination.
•
4 is best placed at the end because “Furthermore” adds an
additional benefit as a concluding expansion (preservation, shelf life, nutrition).