Thanksabhimahna for the detailed post!
Along with the points that you mentioned, the usage of "although" also has a major role to play.
"Although" normally introduces a subordinate clause, just as "while" does. This means we will need a subject and a verb in the sentence containing "Although".
So, for answer choice C, which I selected, we are missing a clear subject and as you mentioned the verb "sighted" in this case, the verb "Sighted"
...
Along with the points that you mentioned, the usage of "although" also has a major role to play.
"Although" normally introduces a subordinate clause, just as "while" does. This means we will need a subject and a verb in the sentence containing "Although".
So, for answer choice C, which I selected, we are missing a clear subject and as you mentioned the verb "sighted" in this case, the verb "Sighted"
...



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