The correct answer is - C) Europe.
The most likely place, from the choices provided, to find a terrestrial communities that are dominated by the temperate deciduous forests, is the European mainland. Europe, or more specifically its northern half, including large portions of Scandinavia, Finland, and the big portion of the northern half of the European part of Russia, is dominated by the temperate deciduous forests, better known as taiga. They are an uninterrupted vast area of thick deciduous forests.
The temperate deciduous forests have some specific characteristics that set them apart, like relatively short and fresh summers, without extremes in the temperature, and very long, cold, snowy winters. The temperatures, in general, are not as extreme as the places north and south of them.