Under coverage might occur if a survey on technology asked questions of? a. a random sample of those who used technology b. independent sample c. a representative sample d. people who subscribed to one particular mobile phone service

The correct answer is option "D"

Under coverage is a situation where the sampling of population is done in a way such that some set of population is left out intententiaonally.  

For example - An interview about the newly launched highway is conducted for determining its impact on the near by property rates, but in this interview only people who have used the highway are being interviewed. In this study all those people who have not used highway are being left out.  

In this question,  people who subscribed to one particular mobile service are being interviewed which will neglect a large mass of people who did not subscribed the said mobile service

the answer to your question is b