Final answer:
Equatorial regions would be expected to experience the greatest increase in temperature in the coming decades.
Step-by-step explanation:
The area that would be expected to experience the greatest increase in temperature in the coming decades is b) Equatorial regions.
Equatorial regions are located near the equator and typically have warm climates and high levels of precipitation. The combination of these factors, along with other climate variables, contributes to the expectation of greater temperature increases in these regions compared to other areas.
For example, land near the ocean may have cooler summers and warmer winters than land farther inland. However, the equatorial regions are characterized by consistently warm temperatures throughout the year due to their proximity to the equator.