Spot the error in the following sentence.
A. Do the flowers in your garden smell
B. more sweetly
C. than those in ours?
D. No error.

B

The correct answer is Option (2) → B (more sweetly)

The word "sweetly" is an adverb, but here we need an adjective to describe how the flowers smell. The correct word should be "sweeter" instead of "more sweetly".

Do the flowers in your garden smell sweeter than those in ours?

Since verbs related to senses (smell, taste, look, feel, etc.) are often followed by adjectives rather than adverbs, "sweeter" is the appropriate choice.