The location of market gardening near large cities is best explained by

The location of market gardening near large cities is best explained by the perishability of products. Market gardening is the small-scale production of fruits, vegetables, and flowers for local consumption. Since the products are highly perishable and have a short shelf life, they need to be transported to consumers quickly to maintain their freshness. By locating the farms near large cities, the distance between the farms and the consumers is reduced, resulting in less time and cost involved in transportation. This ensures that the products reach the market quickly and are sold fresh. Therefore, the correct option from the given choices is "Perishability of products".