Meaning of "an inadvertent action"

[maja]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #90 "High School Vocabulary", question 3

I apologized for what seemed like a deliberate act of rudeness but I explained that it had been purely accidental and an ......... action on my part.

(a) inverted
(b) inadvertent
(c) incurred
(d) inhibited

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #90 "High School Vocabulary", answer 3

I apologized for what seemed like a deliberate act of rudeness but I explained that it had been purely accidental and an inadvertent action on my part.

Correct answer: (b) inadvertent
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can you explain please, thanks.
maya

[Alan]

Hi,

This describes something that happens by chance/by accident. In other words describing an action that is unintentional.

Alan
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English as a Second Language
You can read my ESL story Everything in the Garden is lovely