Answer:
Star A is closer than Star B
Explanation:
As we know that in parallax method of distance measurement the angle subtended by the star when it covers a distance of one Parsec arc length, it is known as parallax angle
Here we can say

so we have

so here we have
angle subtended by Star A = 1 arc sec
angle subtended by star B = 0.75 arc sec
now we have
distance for star A is given as

distance of star B is given as

So star A is closer than star B
When sitting down there is gravity , when sat down the chair is pushing back at a equal but opposite force
The one at the base would be much older due to the law of super position, and the rock at the top would be much newer,again, due to the law of super position.