Which of the following statements illustrates a transition?

a. "Fourth, you should apply varnish."
b. "Today I will discuss the materials you need, how to prepare the surface, and how to apply a new finish."
c. "So, remember to wear safety goggles, work in a well-ventilated area, and dispose of chemicals properly."
d. "Once you have assembled the necessary materials, you are ready to prepare the surface."
e. "Don't buy new furniture. Save money by refinishing your old furniture."

d