Final answer:
In the beginning of this section, the children assume adult responsibilities and may find part-time jobs to support the family due to Rex's irresponsibility.
Step-by-step explanation:
In the beginning of this section, the children in the story start to take on the burden of Rex's irresponsibility by assuming adult responsibilities, like cooking and cleaning (C). They also may find part-time jobs to support the family (A), as the family is struggling economically. However, there is no evidence in the given information to suggest that they start stealing (B) or confront Rex about his behavior (D).