Examine the transitions employed by Amy Tan in "Mother Tongue" and their impact on the flow and coherence of the essay. How do these transitions help guide the reader through different ideas and themes?

A) They create confusion and disrupt the flow of ideas
B) They maintain a consistent flow and coherence throughout the essay
C) They enhance the reader's understanding by smoothly transitioning between ideas
D) They are irrelevant to the essay's overall coherence and flow