Pls help guys its 8th grade history Using the map and your knowledge of U. S. history, what do the details of the Rocky Mountains suggest about the Lewis and Clark expedition?

The group made a grave mistake in not turning back in Missouri.
The group really could have traveled by river all the way to the west coast.
The group would have been better off traveling by horseback the entire journey.
The group most definitely needed a guide to find the easiest route through the mountains.