Final answer:
The agave, lily, and cactus families are types of succulents that store water in their fleshy leaves, stems, or roots to survive in arid environments (Option C).
Step-by-step explanation:
Members of the agave, lily, and cactus families are a type of plant known as succulents. These plants are characterized by their ability to store water in their fleshy leaves, or in some cases, stems and roots. This adaptation allows them to survive in arid environments. Common examples of such adaptations include aloe plants, with their large, hollow leaves, and cacti with stout, barrel-shaped stems.
Succulents have waxy cuticles and often sunken stomata to reduce water loss, enabling them to thrive in environments with limited water resources.
Thus, the correct option is C.