The correct answer is option 4 - Deciduous forest. Deciduous forests are characterized by trees that shed their leaves for a certain period of the year. This is usually in response to changes in temperature, sunlight, and water availability. During the colder months, deciduous trees enter a dormant phase and drop their leaves to conserve energy and resources. This leafless period typically occurs in autumn and winter. In contrast, evergreen forests (option 1) have trees that retain their leaves throughout the year, so they are not leafless for any significant period. Mangrove forests (option 2) consist of trees that are adapted to living in saltwater and their leaves may not fall off entirely. Similarly, scrub jungle forests (option 3) also have trees that may have leaves throughout the year.