Read the passage below carefully and answer the question that follows:
In July 1989, the Nigerian National Petroleum Corporation (NNPC) initiated the construction of the Kaduna Refining and Petrochemical Company's linear alkyl benzene (LAB) plant to reduce foreign industrial reliance. Designed with an initial annual processing capacity of 30,000 metric tonnes of kerosene feedstock, the facility relied heavily on high-sulfur crude imported via pipeline from Escravos. However, operational logs from 1991 indicate that catalyst poisoning forced engineers to reduce daily feed input by 40 percent. Consequently, the plant produced only 18,000 metric tonnes of LAB in its second year of operation, missing its national supply target by 12,000 tonnes. Furthermore, despite recommendations from internal safety auditors to install secondary hydro-treating units, management prioritized expanding the adjacent paraffin wax extraction unit.
According to the passage, what action was taken by engineers in 1991 following catalyst poisoning at the facility?
- The daily feed input of kerosene feedstock was decreased by forty percent.Answer
- BSecondary hydro-treating units were installed across the facility.
- CThe adjacent paraffin wax extraction unit was completely decommissioned.
- DThe crude pipeline from Escravos was permanently closed.