C) 6.781 g
Explanation:
Precision in a reading is the ability to reproduce the same set of results.
Accuracy is the nearness of the measured value to the true value.
Every measurement must be taken accurately and precisely.
Now to determine the value of the block's mass that would be the most precise, let us arrange the masses in their increasing order.
6.759 g, 6.786 g, 6.812 g, 6.779 g
Arranging in increasing order;
6.759 g , 6.779 g, 6.786 g 6.812 g
An value from the option that falls within the given values will make it even more precise;
6.781 g would perfectly fit this condition.
Other values are lower or higher than the given sets.
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