Correct Answer: neither evidence for

Solution : The correct choice is the second option .

Explanation :

The correct structure when using neither is to pair it with nor to form correlative conjunctions. In this sentence, the phrase "neither evidence for" is incorrect. It should be "neither evidence nor". The conjunction "nor" is used to introduce the second element in a negative construction after "neither".

Therefore, the correct sentence is: The radio data shows neither evidence nor ongoing jet activity.