Question

a major environmental issue associated with nitrogen compounds produced by hot internal - combustion engines is
ultraviolet ray blockage
biomagnification in food chains
global warming
acid deposition

Explanation:

1. Analyze "ultraviolet ray blockage": Substances like ozone block UV, not nitrogen compounds from engines. Eliminate this.
2. Analyze "biomagnification in food chains": This involves toxins like heavy metals or pesticides accumulating, not nitrogen compounds from engines. Eliminate this.
3. Analyze "global warming": Main gases are CO₂, CH₄; nitrogen compounds from engines don't drive global warming. Eliminate this.
4. Analyze "acid deposition": Nitrogen oxides (from hot engines) react with water in atmosphere to form nitric acid, contributing to acid rain (deposition). This matches.

Answer:

D. acid deposition