Answer: A. 10 m
Explanation:
To find the length of wire Ryan will need for conducting the experiment in meters we convert the length of wire 100 dm to meters.
10 dm = 1 meter
Ryan has a wire which measures 100 dm .
100 dm = 1x10=10m.
The total length of wire Ryan should measure and use is 10 m.
Option A.10m is the right option.