electromagnetic induction graph of E versus I

1. The problem statement, all variables and given/known data

for this question, i only know that E=-L dI/dt… the ans is C , can anyone explain how to get C?
2. Relevant equations

3. The attempt at a solution

Attached Images
File Type: jpg DSC_0135~5.jpg (228.0 KB)
File Type: jpg DSC_0136~2.jpg (124.5 KB)


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