Answer:
(a) B.Response bias
(b) C.Reword the question
Step-by-step explanation:
The Survey has response bias, because the survey question doesn't reflect the aim of the survey.
The purpose of the survey is to estimate the percentage of people who favor stricter gun laws.
Responses to "Do you favor harsher penalties for individuals who sell guns illegally?" question does not cover people's thoughts about legal gun trade, which may also concerned by the stricter gun laws.
Remedy to this can be to restate the question so that the aim can be addressed.