Calculate the Value Mentally $0.1 ^ { 1 / 2 } \cdot 1000 ^ { 1 / 2 }$

Calculate the value mentally.
- $0.1 ^ { 1 / 2 } \cdot 1000 ^ { 1 / 2 }$

A) 40
B) 10
C) 20
D) 5