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".

[header] How to read a screw thread callout [title] Read the numbers. [step] They will look something like one of these : [substeps] 4-40 x. 5 1/4-20 x 5/8 m3-0.50 x 10 [title] Interpret the first number. [step] The first number gives the major, or largest, diameter. <sep> (A) Next, determine the size of the screw thread you wish to use. Write these numbers down on several pieces of paper and trace around them. (B) It also tells you the larger diameter of a screw thread to create a series of polygons which share a small degree of overlap by a single number. [title] Separate the single digits in each string from each string. (C) [substeps] In unified threads (measured in inches) there are numbered diameters 0 through 10, with 0 the smallest and 10 the largest. ( diameters 12 and 14 may also be found, but are usually on older equipment and needed for repairs or restorations. (D) However, an " x " will bring more light up on an empty needle, so use a tray or ice scraper to fill it to feel the thickness of the screw. The next number tells us that the machine is a small amount bigger or larger than what we used it for.
C

We see the man sitting on the floor talking to a camera. We see the man illustrating break dance moves. The man is talking and sitting still. we <sep> (A) see the man walking through the crowd at room 15 taking pictures. (B) see the man dance fast. (C) see the closing screen and a lady walks into frame. (D) see the following title screen.
B

[header] How to identify shark teeth [title] Search for teeth at the tide line and the shoreline. [step] Go to the beach at low tide and look for the line of debris in the sand. Walk slowly along this tide line as you keep your eyes peeled for teeth. <sep> (A) The tooth for sharks that live in sandy waters is also known as the demon tooth and its characteristics are similar to those of sharks. This may be especially significant if you live in dense sand where there will be a lot of boulders and debris. (B) If the beach is busy, you might have more luck looking right where the waves are crashing into the shoreline so that you can snag teeth before others see them. [substeps] Every now and then, dig up some of the sand along the tide line and/or shoreline and search through it for teeth. (C) Once you see teeth appear on this line, you can get a sense of how they look. You can also use a body watch and watch your hands while you examine teeth. (D) [substeps] Fins with ribbons, lobster teeth, or koistriped teeth are more common than human teeth. [title] Look for shark teeth that have saliva on them.
B