Choose the best answer to complete the sentence.
during the carboniferous period, large swamp forests extended across wet, tropical regions such as north america, eventually forming

a.) tropical rain forests
b.) mountain ranges
c.) vast coal deposits
d.) inland seas

The best and most correct answer among the choices provided by your question is the first choice or letter A. The swamp forests formed into tropical rain forests.

The Carboniferous Period is famous for its vast swamp forests, such as the one depicted here. Such swamps produced the coal from which the term Carboniferous, or "carbon-bearing," is derived. The Carboniferous Period lasted from about 359.2 to 299 million years ago* during the late Paleozoic Era.

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