किस संविधान संशोधन अधिनियम के द्वारा भारतीय संविधान की प्रस्तावना में नए शब्द ('समाजवादी', 'पंथनिरपेक्ष' और 'अखंडता') जोड़े गए थे?

Read the following statements in relation to the 'Basic Structure Doctrine' debate and choose the correct code: A. This doctrine posits that certain fundamental principles and essential features of the Constitution are beyond the reach of amendment by Parliament. B. The Supreme Court evolved this doctrine in the Kesavananda Bharati case. C. A major point of debate with the basic structure doctrine is that it is not explicitly mentioned in the Constitution.

Assertion (A): A Constitution has to be a living thing, living not for one or two generations but for succeeding generations of men and women. Reason (R): The provisions of the Indian Constitution are couched in general terms, for the great generalities of the Constitution have a content and significance that vary from age to age and have, at the same time, transcendental continuity.