Step 1: Plan:
Start with the taglines that are easiest to link to one brand. Then use the leftover pairs and compare with the options.
Step 2: Easy pair first:
I'm lovin it is the global line of McDonald's. So D goes with II. Options with D-IV or D-III cannot be right, so options 1 and 2 drop out.
Step 3: Second easy pair:
Daag acche hain is the long-running Surf Excel campaign about children getting dirty while doing good. So C goes with I.
Step 4: Remaining pair:
LIC and Mountain Dew are left with taglines III and IV. A life insurer speaks about life and beyond life, so LIC goes with IV. Mountain Dew goes with III.
Step 5: Compare with options:
Option 3 gives A-I, which breaks the LIC link. Option 4 shows A-IV, B-III, C-I, D-II, which fits every pair.
Final Answer:
Option 4 is correct, since it is the only one that fits all four brand and tagline pairs.
\[ \boxed{\text{A-IV, B-III, C-I, D-II}} \]