Though the city had been bombed for fifty-seven nights in a row

Though the city had been bombed for fifty-seven nights in a row, the Blitz and the refusal to surrender London afterward took on almost mythic significance as evidence of British citizens’ ability to resist the will of Hitler and Nazi Germany.

• the Blitz and the refusal to surrender London afterward took on-->its not the blitz which took on a significance rather its the londons decision to refuse.
• London’s Blitz and the refusal to surrender took after-->took after is incorrect idiom.
• the Blitz and the refusal of the city of London took over-->changes the meaning.
• London’s refusal to surrender after the Blitz took on--> correct
• London’s refusal to surrender after the Blitz took up -->took up is wrong idiom .