Providing that he works hard, I’ll give him three increments per annum.

1. A Option A: Providing that he works hard, I'll give him three increments per annum.
2. B Option B: Provided that he works hard, I'll give him three increments per annum.
3. C Option C: Condition with he works hard, I'll give him three increments per annum.
4. D Option D: Conditioning with he works hard, I'll give him three increments per annum.

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