The given sentence has been broken up into four different parts. The error, if any, will be in one or more parts of the sentence. Select the option which contains the part of the sentence which is free from an error. If all are incorrect, choose ‘Option 5’ as your answer.

Although the giant squid is an elusive creature (A) / rarely seen by humans, scientists are beginning to (B) / gain a better understanding of the creature (C) / by studying it using remote cameras. (D)