The correct answer is from.
The preposition from is used to indicate a difference or separation between two things. In this case, Sana is different from other girls. This could mean that she has different interests, hobbies, or personality traits. It could also mean that she comes from a different background or culture.
The preposition than is used to compare two things. In this case, we could say that Sana is taller than other girls. However, the question is asking about how Sana is different from other girls, not how she is similar to them.
The preposition with is used to indicate a relationship or connection between two things. In this case, we could say that Sana is friends with other girls. However, the question is asking about how Sana is different from other girls, not how she is similar to them.
The preposition to is used to indicate a direction or destination. In this case, we could say that Sana is going to the store. However, the question is asking about how Sana is different from other girls, not where she is going.