> Extremely high frequency - 3 × 10^7 Hz --(I)
> Range of Microwave radiation given on Wikipedia and quoted by another answer: 300 MHz to 300 GHz
-> 3 × 10^8 Hz to 3 × 10^11 Hz
We can observe from (I) that it fails to fall into this range. For option C however,
Super High Frequency - 3000 MHz to 30000 MHz
-> 3× 10^9 Hz to 3 × 10^10 Hz which is well within the frequency interval stated on Wikipedia.
Thus instead of (D), the answer should be (C).
Also, the question asks for a range, yet the answer refers to only a single frequency value. I believe the answer given by ISRO exam key is incorrect, and so are the other answers given for this question. It would be great if it can be verified by one of the super-seniors.