SATI OG上一道语法题,Theodore Roosevelt was not just a great reform

SATI OG上一道语法题,
Theodore Roosevelt was not just a great reformer;he was also a great president.
答案是以上这句话不用改动,完全正确.
不过还有几个选项：
1、B项说Theodore Roosevelt was not just a great reformer,and also a great president.
B项为什么不对?如果错在and的话,为什么错?and后面的和前面的为什么不是并列的?那应该怎么用and才对?（也就是应该怎么用and改写句子?）
如果是用not but句式的话,是不是改为Theodore Roosevelt was not just a great reformer,but also a great president就对了?
2、E项说Not just a reformer,Theodore Roosevelt was also a great president.
这个选项哪里错了?看不出来啊T-T