The statements provided can be evaluated as follows:
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The evidence makes the claim of genocide plausible, but no more than that.: This statement is somewhat ambiguous. While there is substantial evidence supporting the claim of genocide against Armenians, the term "plausible" may understate the historical consensus on the events that occurred during that period.
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Deported Armenians experienced starvation, violence, and disease.: This statement is true. Many Armenians who were deported during the Armenian Genocide faced horrific conditions including starvation, violence, and diseases during their forced marches and in exile.
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The conditions in the concentration camps were much better than the conditions on the deportation marches.: This statement is false. Generally, many concentration camps also had severe conditions, and the deportation marches were often characterized by extreme hardship, suffering, and high mortality rates.
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Mass killings occurred only after 1915.: This statement is false. The mass killings and deportations of Armenians began in 1915, and while some killings continued in later years, the initial wave of mass violence was predominantly during that year.
Therefore, the most accurate statement among those listed is: Deported Armenians experienced starvation, violence, and disease.