Final answer:
The line 'When in the sun the hot red acres smoulder' sets the initial mood of the poem as intense heat and desolation.
Step-by-step explanation:
The line 'When in the sun the hot red acres smoulder' sets the initial mood of the poem as B) Evokes a mood of intense heat and desolation. The words 'hot', 'red', and 'smoulder' create a vivid image of a barren and scorching landscape. This conveys a sense of heat and desolation, suggesting a somber and harsh atmosphere.