For the supply of materials for concrete, form work reinforcing and placing of concrete, removal of form work and curing of concrete, number of bar(s) required on bar chart, is

Answer: Option D

This is the correct answer. In construction project management using a bar chart (Gantt chart), each activity is represented by a horizontal bar. The activities mentioned in the question include:

1. Supply of materials for concrete
2. Formwork, reinforcing, and placing of concrete
3. Removal of formwork
4. Curing of concrete
Each of these activities requires a separate bar on the chart.