please check my answers, they are Capitalized

Question

1. the SI base unite used to measure mass is the
a. meter
b. second.
C. kilogram
d. liter
2. how does a scientist reudce the frequency of human error and minimize a lack of accuracy?
a. take repeated measurements
b. use the same method of measurements
c. maintain instruments in good working order
D. all of the above
thanks :)

Answer 1

Look fine to me.

(I prefer metre, but I am in Europe)

Answer 2

1) ok
2) A is the best answer, b,c have nothing to do with human error, they have to do with measurement error. Your text may disagree.

We often look for many repetitions, spaced over time, taken by different observers as the best method of minimizing human error.

Now b, c also reduce error, human and instrument.
It may be that the question is looking for this, and D would be the answer. I am not convinced the questions were well conceived, but you may be correct in your text materials viewpoint.

The problem with b and human error is that often when we get wrong results, it is because of the method of measurement, so repeating it wont help.

Answer 3

i think D would be best for me because i wasn't sure if i read about A, but i definitely found B and C in my book. so i think im gonna go with D.
thanks:)