Answer:
The correct option is  B
Step-by-step explanation:
From the question we are told that 
    The  sample size is  
     The  proportion that choose to vaccinate the teen boys is  
considering the first statement 
The 95% confidence interval is 12% ± the margin of error*standard deviation is  false because 
The 95% confidence interval is is  %12 ± the margin of error
considering the second statement 
The confidence interval should not be calculated due to the small sample size is true because from the central limit theorem 
    np =  64 * 0.12 =  7.68 
and this value is  less than 10  hence the confidence interval should not be calculated
considering the third statement 
 A 99% confidence interval will be smaller than the 90% confidence interval is false 
   This is because as the confidence level increase (for example  from 90% to  99%) the margin of error increase which increases the confidence interval