**Explanation:**

Controlling environmental pollution is essential for the well-being of our planet and future generations. There are several ways in which individuals can contribute to this cause. Two effective methods are mentioned in the options: travelling by public transport instead of personal transport and carrying one's own jute or cotton bag for shopping instead of using polybags.

**Travelling by public transport:**
- Public transport such as buses or trains can accommodate a large number of passengers in a single trip. This reduces the number of individual vehicles on the road, which in turn decreases air pollution caused by vehicle emissions.
- Vehicles emit harmful gases like carbon monoxide, carbon dioxide, and nitrogen oxides, which contribute to air pollution and climate change. By choosing public transport, individuals can reduce their carbon footprint and help to control environmental pollution.

**Carrying one's own bag for shopping:**
- The use of polybags for shopping has become a common practice, but these bags are made from non-biodegradable materials like plastic. When polybags are discarded after use, they end up in landfills or water bodies, causing environmental pollution.
- Jute or cotton bags, on the other hand, are biodegradable and can be reused multiple times. By carrying our own jute or cotton bags for shopping, we can reduce the demand for polybags and minimize the amount of waste generated.

**Importance of Options A and C:**
- Option A (travelling by public transport) helps control air pollution, which is a significant contributor to environmental pollution. By reducing the number of vehicles on the road, we can minimize the emission of harmful gases and particulate matter into the atmosphere.
- Option C (carrying one's own bag for shopping) helps control waste pollution. By avoiding the use of polybags and opting for reusable bags, we can reduce the amount of non-biodegradable waste that ends up in landfills or pollutes water bodies.

**Conclusion:**
Both options A and C are effective ways to control environmental pollution. Option A targets air pollution, while option C addresses waste pollution. By implementing these practices in our daily lives, we can make a positive impact on the environment and contribute to a cleaner and healthier planet.

Environmental pollution can be controlled by travelling on public transport and carrying one's own jute or cotton bags instead of carrying plastic bags.