Looking at all the sentences given in question 12, it can be seen that the sentence given in option D is the one that has very clear meaning as it succinctly expresses the information it has to pass across. It is a simple sentence, that has both subject and predicate and it uses simple words that are easily understandable.
Out of all the sentences given in question 13, the most effective of them is the one given in option C. The sentence in option C uses the correct superlative adjective to express the degree of prettiness of John's sister compare to all the other girls at the party. The sentence was well constructed and it clearly expresses the information it has to pass across. The other options given in the question do not effectively express their information.
King's “Dream” speech would play an important role in helping pass the 1964 Civil Rights Act, and the pivotal Selma to Montgomery march that he led in 1965 would provide momentum for the passage later that year of the Voting Rights Act.