According to the principle of original horizontality what most likely happened to the rock layers in the background ?

The principle of original horizontality states that all rock layers were initially deposited horizontally.  The answer must be They were deposited horizontally and then shifted by a geologic event because they other choices all indicate that the the rocks were initially deposited in a way that was not horizontal.

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D. They were deposited horizontally and then shifted by a geologic event.

Explanation: The only one that explains horizontally.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock