sat语法 Most fashion designers agree

sat语法 Most fashion designers agree
Most fashion designers agree (A) that diligence,creativity,and a keen understanding of (B) popular tastes are a requirement (C) for sustained success in their (D) profession.No error (E)
为啥选c
With the current difficulty infilling(A)seats on juries some(B) argue that jurors should be compensatedfor lost wages(C),particularly given theincreasing(D)length of trials．No error(E)
这个选e 但是这个infilling是什么意思 还有seats on 求翻译 不太明白.

1.为什么选C ,个人认为,前面有三项,diligence,creativity,popular tates,都属于必要条件,所以应该改为 are requirements 才对,主谓一致
2.这句话的整体意思我的理解是,
目前陪审团正面临人员短缺的问题,有些人提出补偿陪审员未发的工资,特别是增加试用期的时间是解决的关键.
infill 是动词填实、填入的意思,填满坐席,意即增员的意思.
希望对你有所帮助!