Select the most appropriate option that can substitute the underlined segment in the given sentence.
The enigma of quantum mechanics remains inscrutably elusive despite of decades of intensive research by the world's leading physicists.
- AOption (a)
despite of decades in
- BOption (b)
despite decades of
- COption (c)
despite of decades to
- DOption (d)
despite decades with
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Correct answer
despite of decades in