Sentence A — "The prices of electronic goods are falling." — This is a conclusion drawn from observed price data, hence an Inference (I).
Sentence B — "Since we have substantial reductions in import duties, this is obvious." — This is an evaluative comment based on a cause, making it a Fact (F) because it refers to a verifiable policy change.
Sentence C — "The trend is bound to continue in the near future." — This is a prediction or opinion about the future, hence a Judgement (J).
Sentence D — "But the turnover of the electronic industry is still rising, because the consumers are increasing at a rapid rate." — This is again a verifiable economic observation, hence a Fact (F).
Thus, the classification is: I (A), F (B), J (C), F (D) → IFJF.