Choose the option out of the ones that follow to fill in the blank in the sentence given below.
Heard melodies are sweet ______ those unheard are sweeter.

Correct option is B

The correct option to fill in the blank is (b) but.
Explanation of Correct Answer:
· The sentence expresses a contrast between two ideas:
· Heard melodies are sweet
· Unheard melodies are sweeter
· “But” is a coordinating conjunction used to show contrast or opposition.
· Hindi meaning of but: लेकिन
Example:
· He is rich but unhappy.
Why other options are incorrect:
· (a) yet – also shows contrast but is less direct here.
· (c) and – joins similar ideas, not contrasting ones.
· (d) for – used to give reason, not contrast.