A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is ${\text{C}}_6{\text{H}}_{12}{\text{O}}_6$ then what is the formula for maltose?

1. A
   ${\text{C}}_{12}{\text{H}}_{20}{\text{O}}_{10}$
2. B
   ${\text{C}}_{12}{\text{H}}_{24}{\text{O}}_{12}$
3. C
   ${\text{C}}_{12}{\text{H}}_{22}{\text{O}}_{11}$
4. D
   ${\text{C}}_{12}{\text{H}}_{24}{\text{O}}_{11}$