Directions: In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Cities are the great havens for knowledge, culture, and social life. Vibrant cultures are found in cities because it takes a 1.________ population to support museums, concert halls, sports teams, and night-life districts. Cities also offer rich social opportunities. People in rural areas enjoy only limited social opportunities because 2.________ the small local population. City dwellers can choose their friends and mates from among a large number of people of 3.________ interests and inclinations. We are not likely to abandon the city as a 4.________ institution, but we need to make sure that our transport arrangements do not 5.________ the 'city's' other functions.

Select the most appropriate option to fill in blank No. 5.