Final answer:
The correct scenario representing a case of a saltation resulting in a 'hopeful monster' is when a species undergoes rapid morphological evolution to overcome a novel environmental challenge. Hence, C) is correct.
Step-by-step explanation:
The correct scenario representing a case of a saltation resulting in a 'hopeful monster' is:
C. After a long period of evolutionary stasis, a species undergoes relatively rapid morphological evolution. These 'monsters' had 'hoped' for a new adaptation to overcome a novel environmental challenge.
In this scenario, the species experiences a sudden, rapid change in its phenotype that allows it to overcome a new environmental challenge. This scenario aligns with the concept of saltation, which is a sudden and significant genetic change that leads to the emergence of a new species or adaptation.