A sign with this shape means: Select a letter to choose your answer.
A No passing zone
B Railroad crossing
C Right turn permitted on red
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You didn't give the shape of the sign so...

Explanation:

A No passing zone sign is yellow and pennant shapped (long triangle)

Railroad crossing is a Black X on a yellow circle with R's on either side of the X

Right turn signs are usually white with the words "Right turn premitted after stop" in black lettering

a is the answer because it just is

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