a.As the star gets bigger, the force of gravity also gets bigger, while the radiation pressure stays the same.
b.The star fuses more hydrogen as it gets near the end of its life, then the fusion of hydrogen is converted to gravity.
c.Near the end of its life, a star runs out of hydrogen to fuse, and fusion is what creates the radiation pressure.
d.Gravity increases with time, so the older a star gets, the more it is affected by the force of gravity.How does the inward force of gravity overcome the outward force of radiation pressure during the end of a star?
As discussed in my answer at:
http://answers.yahoo.com/question/index;鈥?/a>
the answer is c).
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