Explanation:

- Option 1: Ne, Ar, Na, Mg

- Ne (Neon) and Ar (Argon) are noble gases (Group 18), but Na (Sodium) is an alkali metal (Group 1) and Mg (Magnesium) is an alkaline earth metal (Group 2). Not in same group.

- Option 2: He, Li, Mg, K

- He (Helium) is Group 18, Li (Lithium) is Group 1, Mg (Magnesium) is Group 2, K (Potassium) is Group 1. All are in different groups.

- Option 3: H, Li, Mg, Ca

- H (Hydrogen) is placed separately, Li (Lithium) is Group 1, Mg (Magnesium) and Ca (Calcium) are Group 2. Not all in same group.

- Option 4: H, Li, Na, K

- H (Hydrogen), Li (Lithium), Na (Sodium), K (Potassium) are all in Group 1 (alkali metals, though Hydrogen is unique).

- They are all included in the same group.