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 add potassium to an organic garden [title] Mix in muriate of potash or sulfate of potash. [step] Muriate of potash, or potassium chloride, and sulfate of potash, or potassium sulfate, are natural minerals. Muriate of potash tends to be cheaper, but the chlorine it contains can hurt the helpful microbes living in your garden's soil. <sep> (A) Gently mix these two together first, then add the zinc sulfate. [substeps] Zinc sulfate is readily available online, or in desalination solutions. (B) [substeps] You can substitute sodium thiamine (ipsin) or baking soda for sulfate because it is the most acidic fertilizer. Sodium thiamine is a common fertilizer in agricultural and organic gardens. (C) Sulfate of potash is safer, but it's a bit more expensive. [substeps] Check your product's label for specific instructions on how much to add per square foot or meter. (D) [substeps] There are many ways to add potassium to soil: you could use the most common method. You could sift the potassium into an empty feed colander and cool it before dropping it off.
[A]: C


[Q]: [header] How to operate a manual pallet jack [title] Find the release lever. [step] Stand behind the manual pallet jack as this is the position you will be in when you move it. Find the small lever that allows the pallet jack prongs (the large flat metal pieces near the floor) to drop all the way down toward the floor. <sep> (A) Pass that lever over the top of the pallet jack, locking it in place with your fingertips. Keep the pallet jack in this position for 45 seconds, until it begins to tilt upwards slightly. (B) Lock the release lever in place and open the pallet jack by rotating it counter clockwise. [substeps] One second later, reverse the motion in the locked position and use the bucket with the release lever to hoist the pallet jack farther up. (C) [substeps] The pallet jack drop lever is often a small lever in the middle of the rounded handle, on the vertical stem of the manual machine. It may be distinguished by a different color of plastic, or otherwise marked, or it may not be. (D) [title] Pull the lever counterclockwise. [step] Steadily pull this lever counterclockwise.
[A]: C


[Q]: A large yard is shown followed by a young child pushing a lawn mower around. the boy <sep> (A) takes the pieces of wood and rows them with the lawnmower using only his two hands. (B) then jumps up on the lawn and turns it on and continues to mow the lawn. (C) continues to push the toy around and stops a few times to bend down to a grown up position. (D) continues pushing the lawn mower around while the camera watches from the side.
[A]:
D