What is the relationship of market gardening to large urban areas?

The relationship between market gardening in urban are listed below and they are known for cultivation of high value crops.

Explanation:

Market gardening is gradually developing and is practiced worldwide. Market gardening and agriculture specialize in the cultivation of high-value crops such as fruits, flowers, and vegetables, individually for the urban markets. It is a kind of commercial agriculture as it is done for a profit and to sell.  Fields are small and are placed where there is sufficient transport connections with the urban center where a high-income group of users resides. Market gardening is mostly done in large urban areas.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Ithink d would be correct