According to some botanists, invasive plants are the second most serious threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems.
A. threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems
B. threat, after habitat loss, to native species of plants and animals and for maintaining biologically diverse ecosystems
C. threat, after losing their habitat, to native species of plants and animals and also to maintenance of biologically diverse ecosystems
D. threat to native species of plants and animals and for maintaining biologically diverse ecosystems, after habitat loss
E. threat to native species of plants and animals as well as to maintaining biologically diverse ecosystems, after losing their habitat
答案是A 考虑平行并列to……and to……我能理解，
但是species能和抽象名词maintainance并列么？
还是我想太多了~？ | 
