Answer:
b. The sharp cries and movements of the bird's family.
Explanation:
Ted Hudges' poem "The Laburnum Top" revolves around the relationship between the tree and a goldfinch bird. The poem delves into how the two depend on each other for their survival.
The laburnum was beautiful in the autumn but quiet. But all this changed after the arrival of the goldfinch birds, with the baby birds all noisily chirping around at the arrival of the mother with food. This is revealed in the lines:
"Then sleek as a lizard, and alert, and abrupt,
She enters the thickness, and a machine starts up
Of chitterings and a tremor of wings, and trilling
The whole tree trembles and thrills"
Thus, the correct answer is option b.