Can we draw the following hypothesis from the context (see options)?

Context:

The Kathlamet people are a tribe of Native American people with a historic homeland along the Columbia River in what is today southwestern Washington state. The Kathlamet people originally spoke the Kathlamet language, a dialect of the Chinookan language. They were also called "Guasamas, or Guithlamethl, by the Clackamas", and "Kwillu'chini, by the Chinook."

Hypothesis: The tribe that lived in the southwestern Washington state spoke many languages, including the Kathlamet and recently moved along the Columbia River.
Options are: a). Yes b). It's impossible to say c). No
a).