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Explanation:

“Capricious” means ‘given to sudden and unaccountable changes of mood or behaviour’ which is dissimilar to “consistent” meaning ‘acting or done in the same way over time, especially so as to be fair or accurate’.
“Erratic” means ‘not even or regular in pattern or movement; unpredictable’, “crafty” means ‘clever at achieving one’s aims by indirect or deceitful methods’ and “obvious” means ‘easily perceived or understood; clear, self-evident, or apparent’. All the other options are not suitable antonyms of “capricious”. Eliminate options 1, 2 and 3.
Hence, the correct answer is option 4.