B. Increased genetic diversity for changing environments
With sexual reproduction an offspring gets a bit of traits from both parents. This means that there is more variety and diversity. Think about humans. We are very genetically divers. There are people with brown hair or blond or red. People with blue, brown, or green eyes. There are also some people that are short or tall. This goes to show that sexual reproduction increases genetic reproduction.
Hope this helped!
~Just a girl in love with Shawn Mendes