Final answer:
The most useful statement to Bob at this point would be to break down his task into smaller, manageable parts.
Step-by-step explanation:
The most useful statement to Bob at this point would be A) "Break down your task into smaller, manageable parts." By breaking the task into smaller steps, Bob can make it more manageable and less overwhelming. This method is commonly used by students to complete large projects or essays. For example, he can brainstorm ideas, develop a thesis, research the topic, create an outline, write a rough draft, revise and edit, and finally develop a final draft.