The correct answer to this open question is the following.
Although you forgot to include the options, we can answer the following.
Divisions between northern California and southern California are exacerbated by conflict over water.
Over time, this conflict has increased. The state of California is suffering from a lack of water. Indeed, water is limited in the large cities of California such as Los Angeles, Sacramento, or Fresno. The water system of California has to serve approximately 30 million people that live in the state.
Things are getting worse due to the many fires that have threatened towns and cities of California.