Which of the following excerpts from "Antojos" is the clearest example of a flashback?

© a
The underbrush stopped abruptly at a high concrete wall, topped with broken bottle glass.
• b
Strips of meat, buzzing with flies, hung from the windows of butcher stalls.
c Yolanda slowed down and kept an eye out for guavas, supposedly in season this far north.
d
In fact, earlier on the road when she had first set out, Yolanda had passed buses and truckloads of men, drinking and shouting slogans

d

In fact, earlier on the road when she had first set out, Yolanda had passed buses and truckloads of men, drinking and shouting slogans