Answer:
The correct option is D) 5.
Explanation:
Consider the provided number 8.1000.
The numbers that contribute to the significance of the total number value are significant figures.
Rules of significant digit:
1) Non-zero digits are significant.
2) If the zeros is in between non-zero digits then it will be significant.
3) If the zeros are leading then they are not significant.
4) If the zeros are at the right of the last non zero digit then they are significant (Trailing Zero).
Now consider the number 8.1000
Since 8, and 1 are non zero digit so they are significant. Here the last three zero is also a significant digit because it follows the 4th rule.
Hence, the number has 5 significant digit.
Thus, the correct option is D) 5.