Right option is (b) Plumbing
For explanation: The pipe wrench (US), Stillson wrench or Stillsons (UK) is an adjustable wrench/spanner used for turning soft iron pipes and fittings with a rounded surface. The design of the adjustable jaw allows it to lock in the frame, such that any forward pressure on the handle tends to pull the jaws tighter together. Teeth angled in the direction of turn dig into the soft pipe.