Which of the following is an example of an attempt to improve an environmental problem caused by chemicals?
O A. Shoveling snow off of driveways in the winter
B. Dumping waste into rivers
O C. Removing lead from gasoline to reduce air pollution
D. Adding pesticides to crops so they will grow larger

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

i'm pretty sure it is letter c.) car

b.

the accuracy of the data.

the answer is option a.