Answer:
Superstition cam be described as people's cultural anxieties or illogical fears that people believe in and abide to. For example, people avoid opening umbrellas in houses because they have heard that it brings bad luck.
This is unclear, but the best answer i can think of would be structure.
The sentence that does not contain any errors is: My brother's graduation from college is a source of pride in our family. The correct answer is option D. Notice that the word "brother" uses 's. 's indicates possession to the word "graduation". 's is only used in nouns.
The option C) The students protested again the tardy policy.
It manages to be concise by using a direct language, a simple structure and just the necessary of words.