A.I. Explanation:

Option 1: "Increasing property values in urban areas."

Explanation: This option is incorrect because the text does not mention property values as a benefit of urban gardening. The focus is on sustainability and local ecosystems, not on real estate.

Option 2: "Reducing the need for public parks."

Explanation: This option is incorrect as the text does not suggest that urban gardening reduces the need for public parks. Instead, it emphasizes the beautification of urban spaces and the benefits of small-scale gardening.

Option 3: "Contributing to sustainability and local ecosystems."

Explanation: This option is correct because the text highlights that urban gardening contributes to sustainability by reducing food miles and positively impacts local ecosystems by promoting biodiversity and improving air quality.

Option 4: "Eliminating the need for rural farming."

Explanation: This option is incorrect as the text does not claim that urban gardening eliminates the need for rural farming. It focuses on the benefits of urban gardening within the city context, not in relation to rural agriculture.