come about vs come across

[The Blue Wonder]

English Language Tests, Intermediate level

ESL/EFL Test #191 "Phrasal Verbs (C)", question 6

He wants to ......... as a mean boss so his employees will work hard for him.

(a) come in
(b) come across
(c) come about

English Language Tests, Intermediate level

ESL/EFL Test #191 "Phrasal Verbs (C)", answer 6

He wants to come across as a mean boss so his employees will work hard for him.

Correct answer: (b) come across

Your answer was: incorrect
He wants to come about as a mean boss so his employees will work hard for him.
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Please explain the answer. Why do we choose " come across"

The Blue Wonder

[Mister Micawber]

.
Come across as = make an impression as, be perceived as.
.
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Native English teacher at Mister Micawber's