Which is the ideal vegetable for waxing process?

Correct option is C

Waxing is done to reduce moisture loss and extend shelf life.
It improves appearance and market value of produce. Tomato is commonly waxed for post-harvest handling.
Onion and chilli are not waxed commercially. Waxing helps delay ripening in tomato.
Thus, tomato is ideal for waxing. Therefore, option (c) is correct.