What does horticulture study?

What does horticulture study?
A: Trees & Forests
B: Plants & Fruits
C: Grasses
D: Algae

Horticulture studies the cultivation of plants and fruits; including vegetables; flowers; and ornamental plants. It differs from forestry; grassland studies; or phycology (algae). Its focus on agriculture and landscaping makes it a key topic in everyday science exams.