![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
The author had trouble operating his VCR because______.
A.
he had neglected the importance of using the timer
B.
the machine had far more technical features than necessary
C.
he had set about using it without proper training
D.
its operation was far more difficult than the designer intended it to be