Step 1: Understanding Section 83 of the CPC.
Section 83 of the Code of Civil Procedure deals with the provision for filing suits by aliens, ensuring that the legal rights of non-citizens are protected when it comes to filing suits in Indian courts.
Step 2: Explanation of the options.
- (a) Section 21A: This section deals with jurisdiction, not with aliens filing suits.
- (b) Section 15: Deals with the place of suing, but not specifically with aliens.
- (c) Section 21B: This section is unrelated to the filing of suits by aliens.
- (d) Section 83: This is the correct answer, as it specifically deals with the provision for filing suits by aliens under the CPC.
Step 3: Conclusion.
Thus, the correct answer is (d) Section 83.