What clues from Boris's story suggest the presence of ethnic tension in Russia today.

A. Boris travels around Moscow by skateboard.

B. Boris competes internationally.

C. Boris and his family decided to change their last name

D. Boris lost his father when he was four years old.

My answer is D.

What story? We can't see your text materials.

While option D, "Boris lost his father when he was four years old," is not directly related to ethnic tension, options A, B, and C provide clues that suggest the presence of ethnic tension in Russia today.

A. Boris travels around Moscow by skateboard: This clue suggests that Boris faces challenges or obstacles in freely moving around Moscow. In some cases, individuals may choose alternative modes of transportation to avoid certain areas or to reduce encounters with potential risks related to ethnic tension.

B. Boris competes internationally: This clue indicates that Boris seeks opportunities outside of Russia, possibly due to limitations or discrimination he may face within the country. This could point to how ethnic tensions affect individuals' aspirations and opportunities within Russia.

C. Boris and his family decided to change their last name: This clue suggests that Boris and his family feel the need to hide or alter their ethnic identity for safety or to avoid discrimination. Such a decision may be driven by the presence of ethnic tension within Russian society.

While D indeed indicates a personal tragedy, it does not directly imply ethnic tension without further context. Thus, options A, B, and C appear to provide stronger indications of the presence of ethnic tension in Russia today.