这个题答案是C还是D？

笨蛋加油

1. GWD30-Q1:
The artistRenoir’s last word was “flowers,” spoken as they arranged a bouquet of rosesjust picked from his garden in a vase on his bedroom windowsill.

A.   as they arranged a bouquet of roses justpicked from his garden
B.   as a bouquet of roses had been just pickedfrom his garden and was being arranged
C.   as a bouquet of roses just picked from hisgarden was being arranged
D.   during the arrangement of a bouquet of rosesjust picked from his garden
E.    while they arranged a bouquet of roses thathad just been picked from his garden
搜以前的讨论说答案是C，我的GWD给的答案却是D，自己也选的D，不过怎么读怎么不明白这个句子的意思，请问正确答案到底是啥？NN帮忙给解释一下，谢啦

笨蛋加油