The right option is; A.) pH lower than 7
pH lower than 7, is the description that is not a property of a base.
A base is any solution that has a pH higher than 7. Bases can either be strong (such as lye, ammonia, bleach), or weak (such as baking soda, and toothpaste). The strong bases can be harmful to organisms and can destroy substances. Bases usually have a bitter taste, and a slimy feel (such as in soap). Bases produce a salt and water when they react with water. Also, they change the color of indicators (turns litmus paper to blue, and turns phenolphthalein to pink).
