The number of the subject always changes if a phrase follows it. true or false

What is the central idea in this advice from branch rickey to jackie robinson?  

3. what is the purpose of a lead sentence or paragraph? to display your most convincing reasons and arguments to you revise the overall structure of your work to interest readers and introduce your writing style to add details and elaborate on your ideas

Which best explains the symbolism of changing weather in "the jilting of granny weatherall"?