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

Context:

On his oak mantelpiece are a drinking bowl from Lake Turkana and an East African gourd, both of which he bought in Nairobi where he went in the fall of 1993 to visit Kitum Cave, the suspected host site for the Marburg virus, which is closely related to Ebola.

Hypothesis: The Marburg virus evolved from Ebola
Pick from:
 a). Yes.
 b). It's impossible to say.
 c). No.