A building which is $64\text{ feet}$ high casts a shadow of length $96\text{ feet}$. Under similar conditions, find the height of a telephone tower which casts a shadow of length $180\text{ feet}$.

1. A
   $80\text{ feet}$
2. B
   $100\text{ feet}$
3. C
   $120\text{ feet}$
4. D
   $90\text{ feet}$