Final answer:
Deserts and temperate grasslands are the most widely distributed biomes on different continents, as deserts are present on all continents except Europe and temperate grasslands are found across multiple large regions globally.
Step-by-step explanation:
The most widely distributed biomes on different continents, based on the choices provided, are b. Desert and temperate grasslands. Deserts are found on every continent except Europe and cover about one fifth of the Earth's surface, occurring where rainfall is scarce. Temperate grasslands are prevalent in several regions, including the midwestern United States, parts of Asia, and South America. These biomes are characterized by their respective climates and ecosystems; deserts with their sparse rainfall and extreme temperatures, and temperate grasslands with their abundant grasses and seasonal climate.