Identify the errors in the given sentence and choose the sentence that rectifies these errors.
Doctor she spoke to at a exhibition was very knowledgeable. The medicines prescribed by him have proved excellent for my father.
1
The doctor she spoke to at exhibition was very knowledgeable. The medicines prescribed by him have proved excellent for my father.
2
The doctor she spoke to at the exhibition was very knowledgeable. A medicines prescribed by him have proved excellent for my father.
3
The doctor she spoke to at the exhibition was very knowledgeable. The medicines prescribed by him have proved excellent for my father.
4
Doctor she spoke to at the exhibition was very knowledgeable. The medicines prescribed by him have proved excellent for my father.