Please choose the best way to make the given sentence written by student correct, more concise and formal: It is apparently that ignorance of humans cause their own afflictions. （ ）
选项：

A:It is apparently that ignorance of humans causes their own afflictions.
B:It is apparent that ignorance of humans causes their own afflictions .
C:It is apparent that ignorance of humans has caused their own afflictions.
D:It is apparent that ignorance of humans have caused their own afflictions.