What type of trees keep their leaves all year round and are often referred to as broadleaf?

The correct choice is evergreen, which refers to trees that retain their foliage throughout the entire year. Evergreen trees are characterized by their ability to photosynthesize during all seasons, providing a consistent green cover. This capability contrasts with deciduous trees, which shed their leaves in the fall and enter a dormant phase during the winter months.

The term "broadleaf" often describes many deciduous trees that have wide, flat leaves, but this does not apply to evergreens, which may have needle-like or scale-like leaves, such as pine and cedar trees. In contrast, annuals are plants that complete their life cycle in a single growing season, and coniferous typically refers to a subset of evergreen trees that produce cones and have needle-like leaves. Thus, evergreen is the most accurate term to describe trees that keep their leaves year-round and can include both broadleaf and needle-leaf species.