Which of the following choices is a sound argument?

• All teachers wear sarees. Mrs. Gomati does not wear a saree. Therefore, Mrs. Gomati is not a teacher.
• All turtles are reptiles. The snake is not a turtle. Therefore, the snake is not a reptile.
• Amitav Ghosh is an author. Arundati Roy is an author. Therefore, I want to be an author.
• All of the above