Three of the following sentences are fused sentences. Choose the one correctly punctuated sentence that is not a fused sentence.
Question 39 options:

a) Water polo was invented during the nineteenth century, but the game has changed a lot since then.

b) Water polo was invented during the nineteenth century the game has changed a lot since then.

c) Water polo was invented during the nineteenth century in contrast the game has changed a lot since then.

d) Water polo was invented during the nineteenth century however the game has changed a lot since then.