Prior to the attack on Pearl Harbor, how did Japan know which ships they needed to
attack?
A. They had an inside man working at Pearl Harbor and sending
information back to Japan.
B. They had satellites up in space spying on Pearl Harbor.
C. They sent tourists over to Hawaii to take pictures and gain
information about Pearl Harbor.

The awnser is B!

Explanation:

Here are more sources where you can read about how Pearl Harbor was planned — https://www.usni.org/magazines/naval-history-magazine/2009/december/how-japanese-did-it

"The key to the success of the Japanese attack on Pearl Harbor-specifically, what enabled the Pearl Harbor Striking Force to reach its launch point undetected (and totally unsuspected) by the Americans-was Tokyo's radio denial-and-deception actions"

"Japanese forces trained for about a year to prepare for the attack. They added wooden fins to their aerial torpedoes and made other modifications, so that they could work on short runs at the 45-foot average depth of Pearl Harbor"

— Hope this helps!! Brainliest appreciated <3