Meaning of 'Once this disclosure is highlighted'

[Eta]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #39 "State Secrets", question 7

Once this disclosure is ......... it's the job of the journalist to follow it through to a satisfactory conclusion.

(a) heightened
(b) highlighted
(c) high pitched
(d) hightailed

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #39 "State Secrets", answer 7

Once this disclosure is highlighted it's the job of the journalist to follow it through to a satisfactory conclusion.

Correct answer: (b) highlighted
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I thought "highlighted" meant "spotlighted". I see you used here in another sense ("emphasize"), but this sentence is still a bit off for me. Can you give me an explanation for the whole "Once this disclosure is highlighted" part?

Thanks.
Eta