In the given question, a part of the sentence is printed in bold. Below the sentence alternatives to the bold part are given at (A), (B), (C) and (D) which may help improve the sentence.
An Australian man, long thought to being associated of the digital currency Bitcoin, has publicly identified himself as its creator.

Options

A. to be associate with that
B. to be associates from the
C. to be associate within the
D. to be associated with the