Answer:
process of extended questioning
Step-by-step explanation:
In the given question, the suffix for the word inquisition is "-tion" which means act or proceedings position held.
The phrase that best defines the word inquisition is "process of extended questioning" on the basis of suffix definition "-tion". As per the sentence, if the lawyer did not believe the witness was telling the truth then he/she will conduct a series or process of questioning, that can reveal the truth.
Hence, the correct answer is "process of extended questioning".