The Materials and Resources (MR) category focuses on reducing the environmental, economic, and social impacts of building materials from extraction to disposal12. It encourages the use of materials that have lower embodied energy, less waste, more recycled content, and better life-cycle performance12.
Reference:
LEED v4: Building Design + Construction Guide - U.S. Green Building Council1 Credit's Supporting LEED's Materials and Resources Category | Legrand2

Quality views to the outdoors belong to the Indoor Environmental Quality category because they support occupant comfort, well-being, visual connection, and satisfaction inside the building. LEED EQ strategies focus on the conditions experienced by occupants, including indoor air quality, daylight, views, acoustics, thermal comfort, lighting quality, and low-emitting materials. Views can reduce stress, improve connection to the outdoors, and support productivity when regularly occupied spaces are designed appropriately. Energy and Atmosphere addresses energy performance and building systems.
Sustainable Sites addresses site design, habitat, rainwater, heat island reduction, and light pollution.
Location and Transportation addresses site location, density, transit, parking, and vehicle impacts.
Because quality views primarily affect occupant experience indoors, the correct category is Indoor Environmental Quality.

Explanation
Sustainable landscape design aims to create landscapes that are in harmony with the local environment, conserve natural resources, and provide ecological benefits. One of the outcomes of sustainable landscape design is restoring and regenerating habitat for native plants and animals, which enhances biodiversity and ecosystem services.

Green power, like all electricity, is typically purchased in units of kilowatt-hours (kWh). This unit measures the amount of energy used over time. For example, a 1-kilowatt (1000 watts) appliance used for one hour consumes one kilowatt-hour of electricity. References: LEED Green Associate Candidate Handbook, U.S.
Green Building Council resources