According to the chart, Allied and neutral shipping losses first reached 600,000 tons in
Based on the graph, the Allies could reasonably expect
shipping losses in May and June to

1. march 1917

2.continue to rise

Explanation:

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option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: