Meaning of 'see about'

[Khanhdoan]

Test No. incompl/advan-6 "Phrasal Verbs", question 7

The time has now come when it will be necessary to ......... making a plan.

(a) see about
(b) see over
(c) see through
(d) see into

Test No. incompl/advan-6 "Phrasal Verbs", answer 7

The time has now come when it will be necessary to see about making a plan.

Correct answer: (a) see about

Your answer was: incorrect
The time has now come when it will be necessary to see through making a plan.
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Dear Sir,
Please explain why we use "see about making a plan" instead of "see through making a plan"?
Thank you very much and Best regards

[Alan]

This means make preparations for something or doing something.
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English as a Second Language
You can read my ESL story Present Simple

[Thuytu9]

Dear Alan,
What is the meaning of "see into". Thanks. :?: