The correct answer is option 2: Heliophytes. Heliophytes are a type of plants or trees that thrive in direct sunlight. They have adapted to receive maximum sunlight for photosynthesis and growth. These trees have evolved certain characteristics to tolerate high light intensities and heat, such as small leaves that reduce water loss, thick cuticles that protect against excessive sunlight, and deep root systems that can reach water sources in the soil. Heliophytes prefer open spaces without much shade from other plants so that they can receive ample sunlight. Xerophytes, on the other hand, are trees that are adapted to survive in arid or dry conditions, saprophytes are plants that obtain nutrients from decaying organic matter, and halophytes are plants that thrive in saline or salty environments.