let us analyze each of the answer options -
A - "a single ancestor's" what? this answer option does not answer the question.
B - "a single ancestor's" what?
the "who" refers to "ancestor's". It should have referred to ancestor.
Also, we need the present tense here - 'who was thought to live'; the "thinking" is still true. so, the subordinate clause should read - "who is thought to have lived".
C - it makes more sense to say that
...
A - "a single ancestor's" what? this answer option does not answer the question.
B - "a single ancestor's" what?
the "who" refers to "ancestor's". It should have referred to ancestor.
Also, we need the present tense here - 'who was thought to live'; the "thinking" is still true. so, the subordinate clause should read - "who is thought to have lived".
C - it makes more sense to say that
...
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