I think that the answer is A .
Yes, there is a variety of things you can do to wear down the enamel. A few of the biggest things are: Drinking Coffee or soda, eating acidic foods and not brushing your teeth. Sadly you are not able to grow back your enamel after if it fully gone so it's best to protect your enamel as much as possible.
"Expectancy-value theory". This theory is based upon what a specific person values determines their motivation.
<span>This would be a paired-samples t test. This type of test allows for the researcher to determine whether or not the dependent variable has a difference from the control that is statistically significant, or if the difference is due to random chance or some other intervening variable not studied.</span>
