CORRECT!

8). Wingtip vortices created by large aircraft tend to

a). rise into the traffic pattern.
b). sink below the aircraft generating turbulence.
c). rise into the takeoff or landing path of a crossing runway.

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The answer is:
b). sink below the aircraft generating turbulence.

Click on the link to the FAA's Aeronautical Information Manual (AIM), Chapter 7, Section 3: Wake Turbulence, which explains what wake turbulence and wingtip vorices are, how they are generated and how to deal with them.

AIM Chapter 7, Section 3: Wake Turbulence

I experienced wake turbulence first-hand on a formation flight. We were a flight of two: a Diamond Katana, which was the lead aircraft, and a Cessna 172. I was in the wingman's position in the 172. I was about three aircraft lengths behind and a little to the left of the lead aircraft when my 172 started to roll forcefully to the right. I applied counter-control inputs and descended slightly until I was out of the Katana's wake. This was at 3500'. I would not want to experience wake turbulence during the landing flare!

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