Difference between largely and overall

[Guest]

Test No. incompl/advan-55 "Finance", question 6

......... it has not been a bad year as our costs are well down on last year's.

(a) Overall
(b) Largely
(c) Mainly
(d) Quite

Test No. incompl/advan-55 "Finance", answer 6

Overall it has not been a bad year as our costs are well down on last year's.

Correct answer: (a) Overall

Your answer was: incorrect
Largely it has not been a bad year as our costs are well down on last year's.
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Please explain me the difference in this context between "overall" and " largely"

[Alan]

Overall means when you consider the whole picture and the word can stand by itself. Largely means considerably and this adverb has to qualify some other word and can't stand on its own. Take this: The year has been largely successful.
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[Rich7]

Overall in this sentence could be substituted by the phrase "in general"...