In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Organic farming 1_______ that nature stays clean and rich. If we visit an organic farm, we will notice a 2________of animal, bird and insect activity. Research shows that around 30% more wildlife and plants thrive 3________ ecologically produced fields compared to conventional farming. This is because there are no pesticides, and fertiliser is used 4________. Covid-19 pandemic has changed the 5________of organic food, with the spotlight now on safety and healthy food that is nutritious to build a strong immune system.
Select the most appropriate option to fill in blank No. 4.