Which question can be answered by science? a. how much pesticide is safe to use on plants
b. how should you feel about using plastics bags
c. should scientists be allowed to do genetic research
d. why do paper bags look better than plastic bags

i believe it is "a" but i want to make sure

Peat deposits are found in waterlogged places where dead plant material piles up. when peat is buried, it undergoes compaction. it is subjected to heat and pressure for a long time, and a lot of water is squeezed out during this process. nearly ten vertical feet of original peat material becomes one vertical foot of coal. which of these remains unchanged in the system during the conversion of peat to coal? a) area b) density c) mass d) volume