Which one of the following is correctly spelled word?

deteriorate

The correct answer is Option (2) → deteriorate

The correctly spelled word is deteriorate. The other words are misspelled.

• Deficiency is spelled with two e's instead of one.
• Diarrhea is spelled with two a's instead of one.
• Dysentery is an infection of the intestines that causes severe diarrhea, often with blood or mucus.