The following data set shows the battery lives in hours of $28$ different smartphone models: $10$, $12$, $14$, $16$, $18$, $20$, $22$, $24$, $26$, $28$, $30$, $32$, $34$, $36$, $38$, $40$, $42$, $44$, $46$, $48$, $50$, $52$, $54$, $56$, $58$, $60$, $62$, $64$. About how many smartphone models have battery lives at or below the third quartile?

• A. $25$
• B. $21$
• C. $20$
• D. $18$

Answer: (B)