Here is the link.. for image A answer the following question.

This figure shows the life track of a one-solar-mass star from its beginnings in a collapsing cloud fragment until it becomes a main-sequence star. At which of the numbered points is the object generating energy primarily from gravitational contraction?

Answer:
a)1 and 2 only
b)1 only
c)2 only
d)3 only
e) 4 only
f) 1,2, and 3 only

Also from the same Image (A)… which numbered point is the object generating energy primarily from hydrogen fusion?

You can use the same answer as the top…

Image (B)

This diagram shows the life tracks from protostar to the main sequence for several stars of different masses. Which track represents the star that takes the longest amount of time to reach the main sequence?

Answer:

a)1
b) 2
c) 3
d) 5
e)2

Thanks
The anwer is

1 2 and 3

4

and 1