The answer is option C: Most people do not wash their hands long enough.
The excerpt claims antibacterial soap is unlikely to work better than regular soap because it needs to remain more time in the skin to be more effective - about two minutes - which people do not do.
The rest of the options are incorrect because the text does not mention the cost of antibacterial soap. It also points out that all bacteria is killed by antibacterial soap, even benign bacteria. Finally, the passage describes antibacterial soap as overrated, but it is not a reason why it does not work better than regular soap.
According to the text “The Truth About Antibacterial Soap”, the antibacterial soup is unlikely to work better than regular soup because “Most people do not wash their hands long enough.” so option C is the correct one. The text provides details that explain that in order for the antibacterial soup to really work, it has to stay on the skin for more than two minutes and most of the times when people wash their hands, they don't do it for that long. Therefore, using an antibacterial soup is the same than using a regular soup if not used for that time and it will not have the desired effects.
