Among scientists, the discovery of the double helix structure of DNA and the genetic code it incorporates is widely regarded to be one of the most significant scientific discovery of the twentieth century.
Among scientists, the discovery of the double helix structure of DNA and the genetic code it incorporates is widely regarded to be one of the most significant scientific discovery of the twentieth century.
Solution
This question tests idiomatic preposition usage and noun agreement.
The phrase "regarded as" is the standard idiom when expressing how something is viewed or considered. Think of it like saying "seen as" or "considered as" - you wouldn't say "seen for being" or "considered like," right? Additionally, after "one of the most significant," you need the plural form "discoveries" since you're selecting from a group.
Option 1 → "Regarded for being" isn't idiomatic; sounds like payment for services.
Option 2 → Perfect! "Regarded as" is correct, plus "discoveries" matches plural requirement.
Option 3 → "Regarded like" is wrong, and "discovery" should be plural.
Option 4 → Missing preposition makes it grammatically incomplete and awkward.
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