Comparing CV and sample SD

Two different brands, namely Brand A and Brand B, of mobile batteries are tested and the following data on their lifetimes (in months) are obtained:

| Brand A | 27 | 28 | 30 | 32 | 33 | |—|—|—|—|—|—| | Brand B | 17 | 19 | 20 | 21 | 23 |

Let $CV_{A}$ and $CV_{B}$ denote the sample coefficients of variation for Brand A and Brand B, respectively. Let $s_{A}$ and $s_{B}$ denote the sample standard deviations for Brand A and Brand B, respectively. Which one of the following statements is true?