The correct option is
D All of these
During Geographical field visit or excursions, one must ensure:
- Not to damage public properties, heritage monuments, etc
- Not to pollute the environment
- to maintain cleanliness
- Not to release waste and throw hazardous substances in the waterbodies, land and air
- Not to harm any other living creatures and animals
- Not to disturb the ecological balance and bio-diversity of the area
Based on the given options, it is therefore can be stated that all the given options should be taken care.
Hence, option D is the correct answer.