Final answer:
The length of string F cannot be determined from the information provided because the length of string G is not known.
Step-by-step explanation:
The question involves finding the length of string F given the relationship between string F and string G. It is stated that string F is 8 centimeters longer than string G, but since the length of string G is not provided, it is impossible to determine the length of string F with the information given. Therefore, none of the options a) 8 cm, b) 19 cm, c) 22 cm, d) 27 cm can be confirmed as correct without additional information about the length of string G.