[tex]= \color{plum}\tt(C) 7 \frac{2}{4} [/tex]
Quantity of water she needs [tex] = \tt \frac{3}{4} \: cup [/tex]
Number of servings she needs = 10
Number of cups of water she will need :
[tex] = \tt \frac{3}{4} \: \times 10[/tex]
[tex] = \tt\frac{30}{4} [/tex]
[tex] =\tt 7\frac{2}{4} \: cups[/tex]
Thus, she needs [tex] \tt 7\frac{2}{4} \: cups [/tex] of water.
Therefore, the correct option is [tex]\color{plum}\tt(C) 7 \frac{2}{4} [/tex]