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Question:

(1) Because this the majority of survivors came from first class.
(2) They were able to reach the deck fastest to get a seat on a lifeboat.
What is the BEST way to revise and combine sentence 1 and sentence 2?

A Because of this, the majority of survivors came from first class, as they were able to reach the deck fastest to get a seat on a lifeboat
Explaination

It is correct because it is the simplest way to express the idea in a grammatically correct sentence. All 3 other choices are not correct. They are not grammatically correct.