Answer:
When the sun is bright on the upland slopes.
Explanation:
In the poem "Sympathy", the line that describes what the bird wants to do is "When the sun is bright on the upland slopes". This line helps the readers to understand how the caged bird longs to be free so that it can fly in the sky freely during a bright sunny day.
It presents a picture of freedom and openness with words like 'upland slopes' and 'bright sun' which are contrary to the bars and the perch of the cage that confines the bird in it.
