Final answer:
The hypothesis 'Children from low-income families experience more parental abuse' is a simple, causal, directional hypothesis because it implies a direct causal relationship between socio-economic status and parental abuse, involving only one independent and one dependent variable.
Step-by-step explanation:
The hypothesis "Children from low-income families experience more parental abuse" is a statement that suggests a directional relationship between socio-economic status and incidence of parental abuse. This hypothesis is simple, as it involves one independent variable (low-income status) and one dependent variable (parental abuse), and it is causal, as it intimates that one variable may be a direct cause of the other. Furthermore, it is directional because it specifies the direction of the relationship (more abuse). Therefore, the correct answer is d. Simple, causal, directional hypothesis.