Spelling Standardization — Choose the correctly spelled past form of ‘‘occur’’ (select from Occured, Occurad, Ocurred, Occurred) with consonant-doubling rule summarized.

Given data

• Base verb: occur (to happen).
• Options: Occured, Occurad, Ocurred, Occurred.

Concept/Approach
When forming the past of ‘‘occur’’ (a stressed final syllable CVC), the final consonant doubles: occur → occurred (double ‘‘r’’) + ‘‘-ed’’.

Option-by-option analysis
Occured — missing the doubled ‘‘r’’; incorrect.Occurad — wrong ending; incorrect.Ocurred — missing one ‘‘c’’; incorrect.Occurred — correct (oc + cur + red). ✅

Memory tip
Stress on the second syllable ‘‘cur’’ triggers doubling: occur → occurred.

Final Answer
Occurred