Soru

Read the passage carefully:

The train station at San Benito was nothing more than a rusted sheet-iron shed and a single wooden bench, warped and silvered by years of salt wind. Clara sat on the edge of the bench, her fingers tightly laced around the leather handle of her valise. Before her lay the salt flats, a blinding, white expanse that stretched to the horizon, reflecting a glare so intense it seemed to scrub the color from the very sky. Across this desert, the heat-shimmer rose in oily waves, distorting the distant mountains into fluid, unreachable shapes. Clara adjusted her wool collar despite the heat; she felt a strange chill radiating from the white earth, as if the salt had long ago drawn all the moisture and life from the soil, leaving only a dry, sterile crust. She looked down at her polished black boots, already filmed with a fine, powdery dust. They had seemed so sturdy in the city, but here, against the vast, indifferent white of the basin, they looked small, fragile, and absurdly out of place, like beetle shells cast up on a dry shore.

In the final sentence of the passage, the description of Clara's "polished black boots" serves primarily to suggest which of the following about her psychological state?