Some diseases can be treated. Purple clothing can be made. Sea animals are not needed to make purple dye. Perkins is famous for discovering a new medicine.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Many years ago, purple dye was made from some sea animals. Then, in 1856, William Perkins tried to make a new medicine. Instead, he found a way to make purple dye from coal. What is a positive effect of his discovery?
Possibilities:
- Some diseases can be treated.
- Purple clothing can be made.
- Sea animals are not needed to make purple dye.
- Perkins is famous for discovering a new medicine.

Sea animals are not needed to make purple dye.