If I had tried again -

A I could solve the problem.

B I could have solved the problem.

C I could solved the problem.

D I could have solve the problem. 

Solution

Correct Answer: Option B

Third conditional এর নিয়মানুযায়ী if যুক্ত অংশে past perfect থাকলে অন্য অংশ sub+could/would/might+have+v3 বসে ।অর্থাৎ If I had tried again I could have solved the problem.

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