From the Caves by Thea Prieto

I’ll check the roots, says Sky, and he trots up the passage before Mark can stop him. Above, in the red firelight of the upper cave, the heat has grown to wringing, and Sky notices at once that Teller has moved. He has dragged himself closer to the fire, his ribs pumping fast from the effort. The hot touch of his skin stings Sky’s fingertips, but he still tugs Teller away from the fire, to where the warmth is drawn upward into the windy main passageway already lit gray with early morning.
Use the excerpt from “From the Caves” to answer the question. How does the sensory imagery of the sky “lit gray with early morning” contribute to the mood of the text?
it gives a sense of desperation
it gives a sense of gloom
it gives a sense of hope
it gives a sense of foreboding

Based on the sensory imagery of the sky being "lit gray with early morning," it contributes to the mood of the text by giving a sense of foreboding.