<span>The question says,'before you use one of the encyclopedias, check .......... its copyright date'. The correct option is A. This is because, the statement is referring to only one of the encyclopedias, and the correct possessive noun for an inanimate object like encyclopedia is it's. 'Their' will only be correct if the statement is referring to all the encyclopedias.</span>
Hey there,
Your question states: <span>Which choice most effectively displays the concept of comparison and contrast?
Based on my understanding, the best option from your answers choices above,your correct answer would be </span>

. My reason on why I say that the answer would be "<span>While they are almost the same size, Earth and Venus have very different terrains." is basically because this would be a good compare and contrast. The other options have no click to it to make a concept of making a compare and contrast. Your correct answer would be D.
Correct answer : "</span><span>While they are almost the same size, Earth and Venus have very different terrains"
~Jurgen</span>