GWD 24-41
In California, a lack of genetic variation in the Argentine ant has allowed the species to spread widely; due to their being so genetically similar to one another, the ants consider all their fellows to be a close relative and thus do not engage in the kind of fierce intercolony struggles that limits the spread of this species in its native Argentina.
A. due to their being so genetically similar to one another, the ants consider all their fellows to be a close relative and thus do not engage in the kind of fierce inter-colony struggles that limits
B. due to its being so genetically similar the ant considers all its fellows to be a close relative and thus does not engage in the kind of fierce inter-colony struggles that limit
C. because it is so genetically similar, the ant considers all its fellows to be close relatives and thus does not engage in the kind of fierce inter-colony struggles that limits
D. because they are so genetically similar to one another, the ants consider all their fellow to be close relatives and thus do not engage in the kind of fierce inter-colony struggles that limit
E. because of being so genetically similar to one another, the ants consider all their fellows to be a close relative and thus do not engage in the kind of fierce inter-colony struggles that limits
怎么就想不明白答案会是c呢？struggles that limits 主谓不一致呀，我觉得d才是正确的答案。要么就是我的题有错了。请那位大侠指点一下。 | 
