求助GWD-30-Q1，一道妖题

The artist Renoir’s last word was “flowers,” spoken as they arranged a bouquet of roses just picked from his garden in a vase on his bedroom windowsill.

1. as they arranged a bouquet of roses just picked from his garden
2. as a bouquet of roses had been just picked from his garden and was being arranged
3. as a bouquet of roses just picked from his garden was being arranged
4. during the arrangement of a bouquet of roses just picked from his garden
5. while they arranged a bouquet of roses that had just been picked from his garden

答案是C

请NN解释下好吗？

拜托了

renoir的最后说的话是flowers, 当一束从他的花园摘下的话被放到他的卧室窗口的时候。

根据意思，就是C了。这题很恶心....