Select the most more appropriate option to fill in the blank.
The prices of railway tickets have gone up________

considerably

The prices of railway tickets have gone up considerably.

Explanation:

• Consider: This is a verb and doesn't fit in the blank as it is not describing the degree of increase in prices.
• Considerable: This is an adjective, which means large or significant in amount. However, it doesn't fit well in this context without the adverb "considerably" to modify the verb "gone up."
• Considering: This is a gerund form of the verb "consider," which doesn't fit the structure of the sentence.
• Considerably: This is the most appropriate adverb to indicate a significant or large increase in the prices of railway tickets.