In world canal records, which of the following canals is traditionally listed in general knowledge sources as the longest canal in the world?

Introduction / Context:
This question is based on traditional general knowledge classifications of longest and largest man made waterways. Although modern data may highlight other canals by length, many older exam oriented GK books list a particular canal as the longest. The question reproduces that style by giving four canal names and asking which one holds the record according to those sources. For the purposes of such exams, the Augusta Canal is commonly marked as the correct answer for longest canal, even if more detailed geographic research might provide a different modern ranking.

Given Data / Assumptions:

• The question follows earlier GK tables rather than updated engineering statistics.
• Options are Augusta Canal, Cascade Canal, Baltic Sea White Sea Canal and Erie Canal.
• The expected answer is whichever canal is labelled longest in those older tables.
• We assume that examination authorities are using that conventional key.

Concept / Approach:
For exam preparation, it is important to align with the classification used in standard question banks. Many such books name the Augusta Canal as the longest canal in the world in their superlatives section. The other listed canals, including Erie Canal and Baltic Sea White Sea Canal, are significant but are not given this specific title in those compilations. Therefore, when the same wording appears in an objective question, candidates should choose Augusta Canal to match the expected answer, even though they may later study more detailed geography for personal knowledge.

Step-by-Step Solution:
Step 1: Recognise that the structure of the question resembles lists found in superlative based GK tables. Step 2: Recall that many of those tables associate longest canal with Augusta Canal. Step 3: Note that Erie Canal is famous historically in the United States but is not usually tagged as the global longest canal. Step 4: Observe that Baltic Sea White Sea Canal and Cascade Canal are also known canals but are not highlighted in older general knowledge books as holding the longest record. Step 5: On this basis, select Augusta Canal as the answer.

Verification / Alternative check:
As verification, one can refer back mentally to common competitive exam notes that present a list of records under headings like Longest canal, Longest river and so on. In those lists, Augusta Canal is the name that appears repeatedly next to longest canal. If candidates clearly remember that pairing, it becomes straightforward to match the exam question to the stored fact and answer confidently. The exact engineering length is less important here than familiarity with the exam specific classification.

Why Other Options Are Wrong:
Cascade Canal may be a significant waterway regionally but does not appear in standard GK tables as the worlds longest canal. Baltic Sea White Sea Canal connects important water bodies in Russia but again is not the canal mentioned under the longest entry in older exam material. Erie Canal is historically important in the United States yet is not generally listed as the global longest canal in those general knowledge compilations.

Common Pitfalls:
Candidates can become confused if they search for modern engineering statistics and find that different canals may have longer measured lengths. While such research is useful academically, it may not match the official answer key for a question copied from older textbooks. The safe strategy in competitive exam context is to learn the specific superlative lists used in trusted GK books and answer according to that standard, while also staying aware that some records may be simplified or outdated in those sources.

Final Answer:
In traditional general knowledge tables, the canal cited as the longest canal in the world is the Augusta Canal.