Which compound sentence is not correctly punctuated?
a. His new watch is self-winding; it still needs a battery.
b. His new watch is self-winding, but it still needs a battery.
c. His new watch is self-winding but it still needs a battery.
b. His new watch is self-winding, but it still needs a battery. It contains a conjunction between the two clauses and has a comma too. Hope this helps.
The correct answer is b because the watch is self winding, however, the watch will not self-wind unless batteries are put in. Hope I helped! Good luck!
