A comparative adjective is used when we compare and contrast two different objects. The adjective is either connected with the suffix -er, or add the word more. From the given sentence above, the comparative adjective used is "more forceful". The comparison is between the mighty water spirit and any creature of land or sea.
<span>analysis using the fact that physical quantities added to or equated with each other must be expressed in terms of the same fundamental quantities (such as mass, length, or time) for inferences to be made about the relations between them.</span>
A. Rather than, I feel as if it’s more of a better answer with more upgraded words, and instead of is a barebones of an answers. So go with Rather than
D because it is comparing two things for clarification.