Step 1: Understanding Lexicographical Order
Lexicographical (dictionary) order arranges words based on alphabetical sequence. For "highest to lowest," we arrange them in ascending order (A to Z) and then reverse to get descending order (Z to (a).
Step 2: Arrange in ascending order (A to Z)
Comparing the first letters of each word:
- M (Mountain) comes first.
- O (Ocean) comes next.
- R (Rainbow) comes next.
- S (Sunflower) comes last.
So, ascending order is: Mountain, Ocean, Rainbow, Sunflower.
Step 3: Reverse for descending order (Z to (a)
Reversing the above gives: Sunflower, Ocean, Rainbow, Mountain.
Step 4: Match with the given options
Option (a) matches exactly.
Final Answer:
\[
{\text{Sunflower, Ocean, Rainbow, Mountain}}
\]