(B) The walk around Saxe-Coburg Square
is the key event in story which leads to Holmes' solution of the case.
<span>D. There is no single topic sentence.
This paragraph is not focused under one single topic sentence, it moves throughout the features of the earth and how they interact and change the face of the planet. In order to bring this paragraph together more clearly, a topic sentence would have to be added that covers all the information in the paragraph.</span>
