Would Be b. because it informing you that she went missing
In order to keep a crew alive on a journey to Mars, a spaceship would need to provide its crew with food, water, oxygen, facilities for rest, a method of waste disposal, room or equipment for exercise, and any need medications.
The answer is (a.) independent clause
An independent clause or usually referred as the main clause is a clause that can stand by itself as a sentence. The independent clause can be a complete sentence because it contains a subject and a predicate.
This is a compound sentence.
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A compound sentence has at least two independent clauses that have related ideas. The independent clauses can be joined by a coordinating conjunction (there are seven–for, and, nor, but, or, yet, so) or a semicolon.
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Read more at http://examples.yourdictionary.com/compound-sentence-examples.html#E96X7TOy96TS81MC.99</span>
