Given data:
The height of block A is h₁=10 cm.
The heigh of of block B is h₂=5 cm.
The block A is sinked by x₁=7 cm.
The fraction of block A in the water will be,
[tex]\begin{gathered} f=\frac{x_1}{h_1} \\ f=\frac{7cm}{10cm} \\ f=0.7 \end{gathered}[/tex]The height submerged in the water by block will be,
[tex]\begin{gathered} x_2=fh_2 \\ x_2=0.7(5cm) \\ x_2=3.5cm \end{gathered}[/tex]Thus, the block B is 3.5 cm in the water.
Option B is correct.
