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". 
--------
Question: [header] How to buy a last minute cheap flight [title] Check airline newsletters, websites that specialize in last minute air travel and the travel section of your local newspaper to find last minute deals on flights. [step] Sometimes you can save money by booking flights late because airlines that have not filled their planes will offer discount fares. [title] Compare airfares from different airlines, websites and travel agencies. <sep> (A) [step] Look at every airline's website so that you can compare and contrast prices. [title] Opt for free flights as before, otherwise follow the full booking program and you'll not miss your flight in a long time. (B) [step] Try booking flights from big-ticket airlines such as kiwi airlines and delta. [title] Compare prices from travel agencies that are offering cheaper flights. (C) [step] Purchasing flights directly from the airline is not always the cheapest deal, so check out a few different travel websites and travel agencies to compare prices. [title] Search for flights during undesirable days and times. (D) [step] Compare each airline's prices with the prices you are interested in. You might be able to find a cheaper flight for free.

Answer: C


Question: [header] How to buy a wood burning stove [title] Consider your heating needs by evaluating the size of your home. [step] You will need to determine the heat load necessary to maintain the square footage of the area you want heated. Heat load is measured in btus, or british thermal units. <sep> (A) Inquire about btus and thermal units using online resources. [substeps] Btus heat packs can be found at home improvement stores, department stores, and some gas stations. (B) To determine how much heat you need, pay attention to the dimensions of each room you intend to fire in. [substeps] The larger the square footage, the larger your fire seats will need to be. (C) You will need 25 to 30 btus per square foot. [substeps] Measure each room to be heated with measuring tape. (D) Btus are rated from 2000-1000. Btus can be changed or altered depending on the size of your home.

Answer: C


Question: [header] How to snake a shower drain [title] Purchase a plumber's snake. [step] A drain or plumber's snake, also known as an auger or a drain claw, is a long, coiled metal spiral that has a graspable handle on one end. Drain snakes can either be manual (in which case you'll crank the handle yourself) or electric (which you can attach to a power drill). <sep> (A) Electric crimps, subfloor pipe assemblies and some sort of ignition wiring are popular alternatives to reverse drain locks. [title] Get a screwdriver that is appropriate for your job. (B) Operators commonly use electric nuts to control their pipes. Alternatively, a plumber will wrap a thread or a couple of picks around the handle, keeping the handle draped over the chain to secure it. (C) Clamp or clamp the cylinder under the tank from the inside out, which you screw through the backside of the crawl tank. [title] Begin by removing the slide slide using your wrench. (D) [substeps] Both manual and electric plumber's snakes should be readily available at your local hardware store or home-supply store. A snake will probably cost around $25 usd.

Answer:
D