As a result of his method for early music education, Shinichi Suzuki h

How do we know this is in the present, and how do we use seen

I was confused between A and E, could you tell me the reasoning for eliminating those options?

Hope it helps

SajjadAhmad , What is the source of this question ?

daagh , putting seen vs known aside, how does present perfect imply that he stopped being known thusly. Isn't that the whole point of a perfect tense ? I can understand that simple present tense is preferable over present perfect in this scenario, but is the explanation given above correct in GMAT environment ?

altair to your query

We don't know much about Suzuki's past nor even his current status . The simple question is whether he is still performing or whether he has vanished into the background. If he is still one the best teachers, then he entails simple present tense as in C. However, if he was good in the past or good from the past does not matter to us, since he may be still be one today. But C removes the doubt forthrightly by saying he is still seen
Another muddled factor is the unnecessary split between seen and known. Whether an artist is seen or known makes little difference as long his performance is good,
After all, an artist has to be first known as good and then only he will be seen as a good when more people venture to visit his programs live.

C must be passable without much ado.