Answer:
A). Imagery.
Step-by-step explanation:
Imagery is described as the literary device that primarily intends to appeal to the senses of the readers through vivid details and descriptions through choice of words and figurative language. It assists the readers to visualize the idea or image and associate it to themselves and have a sensory experience(and elicit desired response).
In the given lines, the author has employed 'imagery' as the use of words like 'grasping', 'shadowy', 'thin' propose vivid description that serve to appeal to the senses(of touch and sight) of the readers and help them to visualize the scenario. Thus, they would be able to elicit desired response. Therefore, option A i.e. 'imagery' is the correct answer.