Question

Don't know much about this kind of stuff.
"Wealth" by Langston Hughes

From Christ to Ghandi
Appears this truth—
St. Francis of Assisi
Proves it, too:
Goodness becomes grandeur
Surpassing might of kings.
Halos of kindness
Brighter shine
Than crowns of gold,
And brighter
Than rich diamonds
Sparkles
The simple dew
Of love.

The line "Goodness becomes grandeur" is an example of which of these?

Answer Onomatopoeia
Simile
Imagery
Alliteration