Why did you use furture perfect tense here?

[Lost_Soul]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #25 "Mark Idioms", question 5

When you look back over her lifetime you can see that she will have made her mark.

(a) be seen
(b) be remembered
(c) be noted
(d) be told

English Idioms and Expressions, Advanced Level

ESL/EFL Test #25 "Mark Idioms", answer 5

When you look back over her lifetime you can see that she will be remembered.

Correct answer: (b) be remembered
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Hi, dear Sir

I dont understand why we have to use the future perfect tense here. I know that to use this tense we must point out a moment in the future by which the action expressed by the verb will have finished. But I cant see the expression of this moment in the sentense, nor can I see how it might be implied.

Could you help me out and explain this riddle for me.

Thank you

[Conchita]

Let's change the first part of the sentence to read:

'After her death' or 'At the end of her life'.

Does it make more sense to you now?

[Lost_Soul]

Hi, Conchita

Now it makes perfect sense to me,
thanks a lot