Let's break this down.

The sentence says:
Among business school students, there is a belief that the more (some adjective) material, the less it will have to do with their future.

Then it says this notion is not contradicted by the fact that successful business leaders read books that are practical.

Blank (i):
- "Apt supposition" = fitting guess.
- "Representative trend" = not quite right because the sentence is about a belief, not a statistical trend.
- "Tacit belief" = unspoken belief - matches "unspoken notion" later in the sentence.

So C. tacit belief fits best.

Blank (ii):
They think the more ________ the material, the less relevant to their future.

The contrast is with "practical guidance" at the end.
So the blank should be the opposite of practical - could be "theoretical" or "esoteric."
"Theoretical" works because business students might think theory is less relevant than practical advice.
"Esoteric" means obscure, but they might still see it as less relevant.
But "theoretical" is a direct opposite of "practical" in a business context.
F. theoretical fits.

Blank (iii):
The sentence says: "This unspoken notion is by no means _________ by the finding..."
"By no means" = not at all.
If leaders read practical books, that supports the idea that non-practical (theoretical) books are seen as less relevant.

So the finding does not contradict the notion - it actually supports it.
So "by no means supported" would mean "not supported" - but that would contradict the logic: the finding does support it. Wait — let's check:

Actually: If leaders read practical books, that agrees with the students' belief that theoretical stuff is less relevant.

So the notion is supported by the finding.
"By no means" = not. So "by no means challenged" = not challenged = supported.
So I. challenged works: "by no means challenged" = supported.
Yes: "by no means challenged" = it is consistent with the finding.