(A) See - discern or deduce mentally after reflection or from information; understand
(B) Establish - set up (an organization, system, or set of rules) on a firm or permanent basis
(C) Realize - become fully aware of (something) as a fact; understand clearly
(D) Search - try to find something by looking or otherwise seeking carefully and thoroughly.
The given word Found means to originate (an institution or organization). The synonym thereby according to the given meaning is option (B) Establish. Option (A) and option (D) are unrelated. Option (C) doesn't fit the meaning of the given word.