The correct answer is C. cooler; warmer.
The inland city is likely to experience cooler summer highs compared to the coastal city because coastal areas tend to have more moderate temperatures due to the influence of the ocean, which can absorb and release heat more gradually. In contrast, inland areas can experience more extreme temperature variations.
In the winter, the inland city may experience warmer winter lows compared to the coastal city. This is because the ocean generally keeps coastal areas milder during winter, preventing extremely low temperatures that can occur further inland.
Therefore, the inland city will probably experience cooler summer highs and warmer winter lows compared to the coastal city.