Good question.
The argument is saying there was some separation happened between tectonic plates. Then it gives an example of South America and Africa and said yes they were separated due these tectonic plates only.
We need to strengthen this by presenting a discovering that proves our point.
(A) A large band of ancient rock of a rare type along the east coast of South America is of the same type as a band on the west coast of Africa. --> Ok, so earth composition found at east coast of one resembles
...
The argument is saying there was some separation happened between tectonic plates. Then it gives an example of South America and Africa and said yes they were separated due these tectonic plates only.
We need to strengthen this by presenting a discovering that proves our point.
(A) A large band of ancient rock of a rare type along the east coast of South America is of the same type as a band on the west coast of Africa. --> Ok, so earth composition found at east coast of one resembles
...
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