Question

what to a slave is the fourth of july test
the word obstructions is derived from the latin prefix ob - and a word root meaning \pile up.\ based on this information and your knowledge of the prefix ob -, choose the most likely meaning of the word obstructions in the following sentence.
ryan explained to his boss that he was late to work because he had encountered several obstructions while driving on the highway.
○ things that aid and are \piled up toward\
○ things that encourage and are \piled up higher\
○ things that move quickly and are \piled up behind\
○ things that block and are \piled up against\

Explanation:

The prefix "ob - " often means "against" or "in the way of". Given that the root means "pile up", "obstructions" would be things that are piled up against (blocking) something. In the context of Ryan being late due to highway issues, "obstructions" as things that block (fit with the prefix and root meaning) make sense.

Answer:

things that block and are "piled up against"