What figure of speech is used by the author to describe the humming bird?

The 'Antithesis' is a contrast or opposition of thought and 'Alliteration' is the repetition of initial sound. There is no hint in the passage of their usage for humming bird. Therefore options (2) & (4) can be ignored. Option (1) 'Metaphor', is used as a figure of speech containing implied comparison e.g. 'curtain of night' or 'all the world's a stage'. No implied comparison has been made for describing humming bird. Hence, even option (1) is incorrect. The line 'Humming bird like tiny jewels' shows the usage of 'Simile'; therefore option (3) is correct.