Whenever people touch any unclean surfaces, they should wash their hands to maintain good personal hygiene.
There are a number of things that help people to maintain good personal hygiene. Some of them are brushing your teeth regularly, washing your hands after the toilet, use of tissue while sneezing or coughing, etc.
Whenever people touch any unclean surface, they should require to wash their hands properly in order to prevent the entry of any pathogen into the body.
Therefore, the correct option for this question is D.
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