Concept:The correct sequence follows logical order: first state the hypothesis, then the intention to test it, then the experiment, and finally the result.
Explanation:Sentence 1 introduces Franklin's hypothesis that lightning is electrical discharge.
Sentence 3 logically follows as it explains his aim to prove this hypothesis through an experiment.
Sentence 2 describes the actual experiment — flying a kite with a metal key during a storm.
Sentence 4 concludes with the outcome: the kite was struck and the key conducted the charge.
Thus, the proper order is 1 → 3 → 2 → 4.
Answer:Option B:
1−3−2−4