Correct IUPAC name is: (3) 3-Ethyl-2-methylpentane

Explanation:
To determine the correct IUPAC name for the given compound, we need to follow the IUPAC rules for naming organic compounds. Let's break down the name and analyze it step by step.

Step 1: Identify the longest continuous carbon chain
The given compound has a chain of 5 carbons, so we consider it as the parent chain.

Step 2: Number the chain
Start numbering from the end that gives the substituents the lowest possible numbers. In this case, we have two substituents: ethyl and methyl groups. Numbering from left to right, we can assign the substituents the lowest possible numbers.

Step 3: Identify and name the substituents
The compound has two substituents: an ethyl group and a methyl group. The ethyl group is located at carbon 3, and the methyl group is located at carbon 2.

Step 4: Arrange the substituents alphabetically
In the name, the substituents are listed alphabetically. The ethyl group comes before the methyl group.

Step 5: Combine the names of the substituents with the parent chain name
The name of the substituents is combined with the name of the parent chain. In this case, the substituents are ethyl and methyl, and the parent chain is pentane.

Step 6: Use prefixes to indicate the number of each substituent
To indicate the number of each substituent, we use prefixes. The ethyl group is at carbon 3, so we use the prefix "3-ethyl." The methyl group is at carbon 2, so we use the prefix "2-methyl."

Step 7: Combine the prefixes and the parent chain name
Finally, we combine the prefixes and the parent chain name to get the complete IUPAC name. In this case, the correct IUPAC name is "3-ethyl-2-methylpentane."

Conclusion:
The correct IUPAC name for the given compound is (3) 3-Ethyl-2-methylpentane.

3 option.