Critical Reasoning

After observing thirty-year-old albatrosses, biologists determined that migration distance in mature albatrosses is directly tied to the lifespan of other fledglings in their brood. Albatrosses that hatched alone or whose fellow fledglings did not survive after their first molting were observed to follow shorter migration paths after thirty years than those that had been accompanied by one or more other fledglings.

If the biologists' determination is accurate, it follows that

A a few albatrosses who molted before maturity are capable of migrating further after thirty years as a result
B the migration distance of thirty-year-old albatrosses is connected to the migration distance of other fledglings
C it is the survival of other fledglings rather than just the birth of those fledglings that more directly affects the migration distance of albatrosses after thirty years
D albatrosses that migrated long distances after their first molting are more likely to migrate long distances after thirty years as well
E the lifespan of other fledglings is more important to albatrosses after their first molting than it is after thirty years

I would like to get an explanation for this CR question. I tried to do it but I couldn't and I got confused. Can any expert help me?

Inference questions require someone to find an answer choice that positively must be true based on the text above. We will start by assuming that everything stated above is true and proceed from there.

Answer choice (A): A few albatrosses who molted before maturity are capable of migrating further after thirty years as a result.

Does the argument say that? Do we know that? Must that be true? I think not. The text does not talk about early molting nor about how this affects migration distance. Eliminate.

Answer choice (B): The migration distance of thirty-year-old albatrosses is connected to the migration distance of other fledglings.

Does the argument say that? Do we know that? I think not. The text does not talk about the migration distance of other fledglings.

Answer choice (C): It is the survival of other fledglings rather than just the birth of those fledglings that more directly affects the migration distance of albatrosses after thirty years.

Does the argument say that? I think it does. The argument says: "...biologists [have] determined that migration distance in mature albatrosses is directly tied to the lifespan of other fledglings in their brood."

Answer choice (C) is fully supported by the text above. Although the question poster did not provide an official answer, I think that (C) must surely be the credited response.