How does groundwater become polluted?

a
Pollutants mixed with water pass through permeable layers above the aquifer.
b
Refuse infiltrates the water table when garbage is dumped.
c
Factories dump their waste directly into aquifers.
d
All of the above

I would say d, all of the above.

All of the above is the right answer

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.