Question Statement:
A paper describes a field trial failure in paragraph 1, diagnoses unexpected soil salinity as the root variable in paragraph 2, and tests modified gypsum remediation in paragraph 3. The structural flow is:
Options:
- (A) Phenomenon $\to$ Diagnosis $\to$ Remedial action
- (B) Abstract theorem $\to$ Proof $\to$ Generalization
- (C) Historical context $\to$ Modern critique $\to$ Rebuttal
- (D) Definition $\to$ Classification $\to$ Examples