Which quotation from the poem “sonnet in primary colors” by rita dove includes an allusion?

The sentence that contains an allusion is:

'Diego's  love a skull in the circular window'

Explanation:

The beautiful poem 'Sonnet in Primary Colors' celebrates the work and life of Frida Kahlo one of the great artists of the 20th century and her troubled life.

The poem contains many beautiful imagery metaphors and allusions and this particular line of allusion stands out as a richly loaded one.

It talks about Frida's lifelong lover Diego and his very long phases of infidelity to her which went on for life but she refused to leave him.

This line alludes to that love of his that had gone awry by the use of a skull.