In the sentences, the dependent clauses are given as when their ship docked and bringing their family to a total of five daughters and six sons. Thus, 1. option A is correct.
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Dependent clauses are incomplete phrases that cannot complete the sentence and are not able to express the ideas and the thoughts of the sentence completely.
When they are present in the sentence they act as subordinate to the main clause of the sentence and include the verb and the subject. Here in the first sentence, the phrase, when their ship docked and in the second sentence, bringing their family to a total of five daughters and six sons is incomplete and does not express the thought entirely.
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