What does this phrase mean: 'carried on regardless'?

[Heiner]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #4 "How Mary fell in love", question 6

He started hammering on the adjoining wall but Mary carried on regardless.

(a) took little interest
(b) took some notice
(c) took not the slightest notice
(d) took the most interest

English Idioms and Expressions, Advanced Level

ESL/EFL Test #4 "How Mary fell in love", answer 6

He started hammering on the adjoining wall but Mary took not the slightest notice.

Correct answer: (c) took not the slightest notice
_________________________

What does this phrase mean: 'carried on regardless'?

Heiner

[Mister Micawber]

.
carried on regardless = took not the slightest notice and continued.
.
_________________
Native English teacher at Mister Micawber's