Answer:
 C. Favorite baby name is a qualitative variable. Its values are not numerical. 
Color of car is a qualitative variable. Its values are not numerical. 
Storage space on a computer drive is a quantitative variable. Its values are numerical.
Electrical current is a quantitative variable. Its values are numerical.
Step-by-step explanation:
A qualitative variable is a variable that is categorical and isn't numerical. 
For example, your favourite baby names and colours are categorical, they cannot be measured on a numerical scale
Quantitative Variable are  variables that can be measured on a numeric scale.  Ordinal, interval and ratio scales are quantitative scales. 
Storage space can be measured on a numeric scale e.g. the storage space has 400 GB
Electric current can be measured on a numeric scale e.g. eclectic current is 50 volts