The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.

P:  In addition to major financial burdens, they can impose substantial time demands on uninjured family members. 

Q: Occupational injuries and illnesses can provoke major crises for the families in which they occur. 

R: Not just families, but also businesses suffer great setbacks due to occupational hazards and therefore, companies must realise the importance of occupational safety.

S: Today, when many families are operating with very little free time, family resources may be stretched to the breaking point.