Which of the following has the same meaning as 'tone'? a form b value c shade d texture

The answer is B. Value, 

The answer is B, because in art, tone refers to the degree of lightness or darkness of an area. ... Dictionary entries sometimes use define tone or as referring to color, but artists use hue or chroma to refer to this quality, preferring to use tone, tonal value, or value to describe lightness or darkness.

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The period that marks the paleolithic era is between the 250,000 to 10,000 years.