More than fifty years after the Second World War, a number of African American soldiers were awarded ― some of them posthumously ― with the Congressional Medal of Honor, which was the nation’s highest military award, and which was long overdue in recognition of their outstanding bravery.
A.    with the Congressional Medal of Honor, which was the nation’s highest military award, and which was long overdue in
B.    with the Congressional Medal of Honor, the nation’s highest military award for long-overdue
C.    the Congressional Medal of Honor, which was the nation’s highest military award, long-overdue in
D.    the Congressional Medal of Honor, the nation’s highest military award for long-overdue
E.    the Congressional Medal of Honor, the nation’s highest military award, in long-overdue
 
选E，为什么呢？in long-overdue是什么结构呢？D错在哪里了？？

in...recognition of something

the nation’s highest military award 是插入语修饰，需要一前一后两个逗号隔开的
而且D改变原意了
long-overdue修饰werea warded，而不是the Congressional Medal of Honor

A - Which is redundantly used.
B. with B the sentense becomes
....For Long Overdue recognition

The award was not given because the recognition was long due...it was being given for the bravery.

Going by the same reason D is also ruled out

C. sounds as if the Congressional medal was long overdue in recognition...

Hence E is the best choice.

排除 medal of honor 后接的whichAC
用同位语修饰，award sb sth 只剩DE
in long-overdue recognition 修饰同位语，如果是for改变原文的意思