Context: I suspected was the shampoo problem . Recently I just changed her shampoo , usually Carmen use Baby Johnson shampoo , current shampoo was give by my mother in law friend , because she bought extra . That 's what my mum and I suspect , so I quickly change back her shampoo to the original shampoo .

Question: what may be the plausible cause for the concerns I have for Carmen 's hair ?
Options:
0. Because Carmen has tried only two shampoo brands
1. Because the shampoo is an extra of a set
2. None of the above choices .
3. It is highly likely that this due to the change in shampoo
Answer: 3