Among 10-year-old children in 1900, only 1 in had all four of their grandparents still living.

25

Explanation:

This number is significantly lower compared to today's society.

At that time  lack of food resources , inability to medically solve various type of illness and war that keep occurring contribute a lot to the death of World's population.

This make a lot of people died at a very young age, so very few of them actually able to live long enough to see their grand children.

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.