[讨论]conception of sth is sth到底有没有错？？？

GWD-10-Q2: GWD-11-10

Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is precisely the opposite, a tool for communicating with a large, public audience.

1. Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is

2. Marconi conceived of the radio as a substitute for the telephone, a tool for private conversation, but which is

3. Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become

4. Marconi conceived of the radio to be a tool for private conversation, a substitute for the telephone, which has become

5. Marconi conceived of the radio to be a substitute for the telephone, a tool for private conversation, other than what it is,

想知道这道题A错的原因到底是因为没有conception of sth is sth这种搭配，还是因为名词conception同动词conceive sth as sth相比后者比较好？谢谢...