Low ph means that the hydrogen-ion concentration is a. equal to the ph number b. low c. high d. in the middle

High

Explanation: I got it right on the test :)

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.