Equation of an ellipse
→having center (0,0) , vertex (
and covertex
and focus
is given by:

As definition of an ellipse is that locus of all the points in a plane such that it's distance from two fixed points called focii remains constant.
Consider two points (a,0) and (-a,0) on Horizontal axis of an ellipse:
Distance from (a,0) to (c,0) is = a-c = 
Distance from (-a,0) to (c,0) is = a + c = 
a -c + a +c
= a + a
= 2 a →(Option A )
There are 6 different ways:
23,598
23,958
25,398
25,938
29,538
29,358
B is the answer and why is bc I took the quiz
8.52624 is not the same as 5.85, 63.4 , and 27.5.
Hope this Helps!!