In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

[Q]: [header] How to paint masonry walls [title] Remove any flaked or peeling paint from the masonry. [step] If the wall has already been painted, you need to remove any old paint that is loose, peeling, or flaking away. On an exterior wall, this is most efficiently done with a sandblaster. <sep> (A) New paint must be removed from the wall first, gently scraping around the edges with a rat-tail tail reciprocating scraper. This is most often done on exterior paint walls that are still meant to protect it from debris. (B) In areas where a sandblaster would be too messy and cumbersome, loose paint can be removed with a stiff wire brush and a paint scraper. [substeps] Failing to remove loose and peeling paint can result in the paint flakes mixing in with your fresh coat of paint and marring the finish. (C) [substeps] Make sure to turn off the water. Do not flush the wall down the drain. (D) If there is a paint-resistant paint strip still clinging to the wall, it may be painted to the wall as well, but not directly under it. [substeps] Using a sandblaster may be wise, but if the paint is not taking off, it may be better to start by sanding lightly.
[A]: B


[Q]: [header] How to stop picking your scabs [title] Disinfect the wound. [step] Open wounds and sores can develop infections. Always wash a new wound thoroughly with soap and water as soon as you obtain it. <sep> (A) Do not use hydrogen peroxide, petroleum or other deodorizers. Do not use antibacterial or antiseptic cleaners, as these may irritate the wound. (B) Then clean it up with an antiseptic wipe or a bit of neosporin and apply a bandage to protect it while it heals. You can also try using betadine or peroxide on the wound to clean and remove unwanted bacteria. (C) [substeps] Spread antibiotic ointment onto the wound, cover the wound with a sterile dressing that may be applied to the wound if it requires it. If you get a scab, wait 15 minutes to let the ointment finish fully absorbing in to the wound. (D) At least once every two weeks, take a shower or bath for seven to 10 days and splash your wound with warm water before applying bandages. Use soap with antibacterial properties and do not share it with others.
[A]: B


[Q]: [header] How to center the jets on su carburetors [title] Loosen the 13/16 " locking nut on the bottom of the jet assembly with a deep well spark plug socket wrench. [title] Get out your 5/8 " socket and unscrew the mixture nut just below it. [title] Pull out the jet and remove the mixture tension spring. <sep> (A) [title] Unscrew the cable connector that attaches the pressure plate and the release release spring. [title] Remove the top of the jet assembly and remove the screws at the upper end (e.g. (B) [title] Open the " cover " on the top of the jet assembly with the hand wrench and remove the 1/8 " linking wire that it came in to. [title] Unscrew the lower three " locking " nuts which will come in various sizes. (C) [title] Replace the mixture nut and the jet. [step] Screw the nut up as far as it will go and push up the jet as far as it will go. (D) [title] Remove the radioactive dust and debris from the jet. [step] This buildup of debris and trapped gas can obstruct air flow as it moves along the jet.
[A]:
C