The argument that is based on faulty reasoning is:
A. The new “Brush Right” electric toothbrush is easier for kids to hold.
This statement makes a subjective claim without providing specific evidence or data to support it, such as comparisons with other toothbrushes in terms of weight balance, grip design, or child usability studies. The assertion that it is "easier to hold" is not necessarily quantifiable or demonstrated, as individual experiences can vary significantly based on a child's personal preferences and hand size.