Statement (A): Secondary suffix indicates the nature of the functional group which is added after primary suffix.

 Statement (B): The terminal ‘e’ of the primary suffix is replaced by secondary suffix. 

Statement (C): Secondary suffix for the functional groups $\text{'}-\mathrm{OH}\text{'} \mathrm{and} =-\text{'}\mathrm{CHO}\text{'} \mathrm{are} \text{'}\mathrm{ol}\text{'}\mathrm{and} \text{'}\mathrm{al}\text{'}$respectively