Answer the following question given this paragraph: 

Many mutations are not caused by errors in replication. Mutations can happen spontaneously, and they can be caused by mutagens in the environment. Some chemicals, such as those found in tobacco smoke, can be mutagens. Sometimes mutagens can also cause cancer. Tobacco smoke, for example, is often linked to lung cancer.


Q: What can happen spontaneously or as a result of mutagens in the environment?

 Choices:

- lesions

- combustion

- traits

- mutations

A:
mutations
