Choose the correct sentences.
a. This room is much large.
b. He drives very carefully.
c. This room is very larger than the other.

The correct answer is Option B (b only).

Key Points:
• The question tests the usage of modifiers 'very' and 'much' with different degrees of adjectives/adverbs.
• Rule: 'Very' is used with the positive degree of adjectives/adverbs, while 'much' is used with the comparative degree.
• Sentence (a) is incorrect because 'large' is positive degree, so it should be 'very large', not 'much large'.
• Sentence (c) is incorrect because 'larger' is comparative, so it should be 'much larger', not 'very larger'.
• Sentence (b) is grammatically correct as 'very' modifies the positive adverb 'carefully'.
• Key Takeaway: Use 'very' with positive degree (very large) and 'much' with comparative degree (much larger).