Answer:
B
Step-by-step explanation:
B: B is a strong compare-and-contrast text structure. ou would be comparing how road bikes are different from mountain bikes.
C: This one is a little less direct, but you could compare how the biking trails are different.
A: There is probably one set way to properly ride on the mountain bike trails.
D: You would be writing about what the equipment is and why it is important. There is not much compare and contrast that could be done.