Read the passage: 'Urban farming has gained popularity in recent years as city dwellers seek fresh produce. Rooftop gardens and vertical farms now supply local restaurants and markets. However, critics argue that the high startup costs and limited yield make urban farming economically unviable for most investors.' What is the MAIN IDEA of this passage?
-
A
Urban farming is a growing trend but faces economic challenges
-
B
Rooftop gardens are the best way to grow food in cities
-
C
Local restaurants prefer buying from urban farms
-
D
Startup costs for any business are always too high