In the following question, a part of the sentence is printed in bold. Below are given alternatives to the bold part at (1), (2) and (3) which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (4).
I am thinking to do an M.A. in English.
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I am wondering to do an M.A. in English.
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I am thinking of doing an M.A. in English.
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I am thinking doing an M.A. in English.
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No improvement.
B.
I am thinking of doing an M.A. in English.