Correct the possessive noun in this sentence: if they feel threatened, a cobras hood will spread out making the snake look more frightening

cobra's hood

Explanation: The sentence above presents a mistake in the use of the possessive. When you want to say that a noun belongs to another noun you have to use the possessive form 's. Except if the noun finishes with S, you just add the '.

In the example given the possessive form should be in the noun "cobra", this is why the correct form is "cobra's hood" to express that the hood belongs to the cobra.

3 is blunder, i’m not sure about the last one but the first two look correct