An index is an example of A.) A primary source
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I believe the answer is A
After analyzing the conjunctions provided in the answer choices to combine the two ideas, we can form a single sentence as follows:
The astronauts must eat the fresh foods right away because the ISS has no refrigerators.
<h3>What are conjunctions?</h3>
A conjunction is a word used to connect other words, phrases or clauses in a sentence. A subordinating conjunction (as the ones provided) is used, more specifically, to connect two clauses by establishing a relationship of dependency between them.
To combine the two ideas given, the best conjunction seems to be "because". "Because" is used to explain the reason of something. Here, it will be useful to explain why the astronauts have to eat the fresh foods right away.
Learn more about conjunctions:
brainly.com/question/8094735
<span>Rising action, climax, and falling action are all part of the plot. Setting describe where the story is taking place, such as in a house, or in the early 1900's. Conflict describes the struggles that happen between two things, such as the character and society, or between two different characters. Symbolism refers to the idea of an object or an event in the story meaning something greater. Finally, the current answer, plot, refers to the different parts of the story. The rising action is the start of the story, the climax is where everything happens, and the falling action is the resolution of all of the events.</span>