What does "look into" mean?

[Utah]

English Language Tests, Intermediate level

ESL/EFL Test #140 "Idioms with the phrasal verb look", question 2

The treasurer assured his constituents that he would ......... the scandal shortly after the results of the general election were made public.

(a) look into
(b) look up
(c) look over
(d) look after

English Language Tests, Intermediate level

ESL/EFL Test #140 "Idioms with the phrasal verb look", answer 2

The treasurer assured his constituents that he would look into the scandal shortly after the results of the general election were made public.

Correct answer: (a) look into
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What does "look into" mean?

Utah

[Mister Micawber]

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The answer is directly above your question.
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Native English teacher at Mister Micawber's