A solid block has dimensions $L$, $2L$ and $4L$. It is placed in water of uniform density with the faces of greatest area lying horizontally, as illustrated. The upthrust on the block is $U$. The block is then turned into a different orientation so that the faces of least area are horizontal. The block stays completely submerged in the water. What is the upthrust acting on the block in its new orientation?
- A$\frac{U}{4}$
- B$U$
- C$2U$
- D$4U$