Acknowledgement for mathematics

Which of these best explains why the argument in this passage is weak? (5 points) the argument doesn't take into account opposing points of view. the argument relies on attacking a weak version of the opposition. the claim is not valid. the argument relies on claims that are not backed up by facts.

Read the sentences. the lowest point in antarctica appears to be the bentley subglacial trench, which is 8,200 feet below sea level. lower points may exist. which choice correctly uses the subordinating conjunction “although” to combine the sentences? the lowest point in antarctica appears to be the bentley subglacial trench, which is 8,200 feet below sea level, although lower points may exist. the lowest point in antarctica appears to be the bentley subglacial trench, which is 8,200 feet below sea level. although lower points may exist. the lowest point in antarctica appears to be the bentley subglacial trench, which is 8,200 feet below sea level although, lower points may exist. the lowest point in antarctica appears to be the bentley subglacial trench, which is 8,200 feet below sea level; although lower points may exist.

Which should be added after the sentence 6 to most effectively move a the plot forward