Step 1: Understanding Section 159 of the CrPC.
Section 159 of the Criminal Procedure Code empowers a magistrate to order the police to investigate a case if the police initially decides not to investigate. The magistrate can also exercise powers when an investigation is ongoing.
Step 2: Explanation of Other Options.
- (a) A magistrate can order the investigation if the police decide not to proceed.
- (b) The magistrate can intervene while the investigation is ongoing if necessary.
Step 3: Conclusion.
The powers under Section 159 of the CrPC can be exercised in both situations mentioned, making (c) the correct answer.