Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Anna had two daughters and was a single mom. Then she found out she was pregnant with a son. She had no idea how to raise a boy without a man to help! When her son was born, though, she decided to just do her best. She knew all her son really needed was love and care.
 selected sentence: Anna had two daughters and was a single mom.

The father of Anna's children leaves Anna and her daughters >Causes/Enables> Anna is a single mom