please help me figure this out

Which of these conversions is correct?

Select one:

a. 1 m = 10^-6 mm

b. 1 pm = 10^-9 m

c. 1 nm = 10⁹m

d. 1 km = 10⁶ mm

Which of these is an example of a systematic error?

Select one:

a. Parallax Error

b. Human reaction time

c. Imprecision of the instrument

d. Poor calibration of scale

How would you write this number in scientific notation: 45,769,800,000

Select one:

a. 4.57698 x 10¹¹

b. 4.57698 x 10¹⁰

c. 4.57698 x 10^-11

d. 4.57698 x 10^-10

How many seconds are in 1 day, 2 hours, 10 minutes and 40 seconds?

Select one:

a. 11,400 seconds

b. 223,840 seconds

c. 2,200 seconds

d. 94,240 seconds