SAT语法IS题OG第6套这道该怎么写?

SAT语法IS题OG第6套这道该怎么写?
(Having Florence Nightingale as their leader) and a growing awareness of the need for cleanliness helped to bring about xxx
A,原句
C,Florence Nightingale as their leader
E,the leadership of Florence Nightingale
C,E区别在哪,求详解
再加一题啊 Marathon racing, a challenging test of endurance, (has become) (increadingly) popular (among) amateur athletes in the (last few) years.
第一个没错吗