On average the footprints discovered are 14 to 18 inches long 5-9 inches wide and much l

问题补充：

On average, the footprints discovered are 14 to 18 inches long, 5-9 inches wide and much larger than of a human.

A. that

B. ones

C. those

D. one

答案：

A. that

B. ones

(答案→)C. those

D. one

解析：

这题考查代词those的用法，those一般代替前文出现的可数名词复数，这句话里代指footprints，that代指前文的可数名词单数或是不可数名词，one泛指可数名词单数。选C。