Select the most appropriate option that can substitute the underlined segment in the given sentence.
I prefer walking than riding.

The correct option is walking to riding.

Explanation:
1. Grammatical Rule: The verb "prefer" is used to express a choice of one alternative over another. When comparing two actions expressed as gerunds (verb ending in -ing), the verb "prefer" is followed by the preposition "to" rather than "than".
2. Correct Structure: The standard grammatical structure is:
prefer + [gerund/noun] + to + [gerund/noun]
3. Analysis of Options:
• "walking than riding" uses "than", which is incorrect with "prefer".
• "walking above riding", "walking from riding", and "walking with riding" use incorrect prepositions.
• "walking to riding" correctly uses the preposition "to".

Correct Sentence:
"I prefer walking to riding."