Combine the following sentences using an appropriate conjunction from the given options.

Azim works hard Kabir works harder.

A. Azim works hard but Kabir works harder.

B. Both Azim and Kabir work harder.

C. Kabir and Azim work harder.

D. Kabir, Azim work harder.

Please do not use chat terms. Example: avoid using "grt" instead of "great".