Why do presidential candidates focus on battleground states?

answer; /// i believe that the correct answer is (d)the huang he river valley;

when in doubt choose c

it's what my teacher told my class when we were going into psats

the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.