Hi,
I'm not an expert,but let me try.
A. Marconi’s conception of the radio was as a substitute for thetelephone, a tool for private conversation ; instead, itis
-- modifier error : "a tool for private conversation" is supposed to refer to radio
B. Marconi conceived of the radio as a substitute for thetelephone, a tool for private conversation , but which is
-- same as option A
C. Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone;
...
I'm not an expert,but let me try.
A. Marconi’s conception of the radio was as a substitute for thetelephone, a tool for private conversation ; instead, itis
-- modifier error : "a tool for private conversation" is supposed to refer to radio
B. Marconi conceived of the radio as a substitute for thetelephone, a tool for private conversation , but which is
-- same as option A
C. Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone;
...
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