The natural vegetation of South east China is subtropical broadleaf evergreen forest. It is important to understand the characteristics of each option to determine the correct answer.

Option 1: Subtropical broadleaf evergreen forest. This type of forest is found in regions with warm and humid climates, such as South east China. The trees in this forest are typically evergreen, meaning they retain their leaves all year round. They have broad leaves that are adapted to capture sunlight efficiently. This type of forest is characterized by high biodiversity and dense vegetation.

Option 2: Tropical broadleaf evergreen forest. This type of forest is found in tropical regions, typically near the equator. It is characterized by high rainfall and high temperatures throughout the year. The trees in this forest are also evergreen, with broad leaves. However, South east China does not have a tropical climate, so this option is not correct.

Option 3: Tropical deciduous forest. This type of forest is found in regions with distinct wet and dry seasons. The trees in this forest shed their leaves during the dry season to conserve water. South east China does not have a distinct dry season, so this option is not correct.

Option 4: Temperate evergreen forest. This type of forest is