Recent study of symptoms performed at the Department of Symptoms at a leading health care institute has demonstrated that
some signs that seem alarming may actually be harmless and
those seem to make no biological sense may indicate a serious condition.Recent study has demonstrated (two things) that some signs that seem alarming may actually be harmless and
those (signs-plural) that seem(plural) to make no biological sense may indicate a serious condition
A. those(signs) seem to make no biological sense may indicate a serious condition. - run on - incorrect
B. those that seem to make no biological sense may indicate a serious condition. - Correct as explained above
C. those that seem making no biological sense may indicate a serious condition. signs that seem making is incorrect
D. some signs that making no biological sense may indicate a serious condition. -use of making is incorrect
E. some signs that seem to make no biological sense indicate a serious condition. - meaning change - incorrect
Answer B