Section 5 of the Limitation Act, 1963 provides for extending the limitation period in cases where the applicant was prevented from filing/acting due to sufficient cause. However, Section 5 expressly does NOT apply to: (a) suits (which are governed by fixed limitation periods under the Schedule), (b) execution proceedings under CPC Order 21 (which have their own specific provisions), and (c) proceedings under special enactments like the Hindu Marriage Act where special limitation provisions apply. Section 5 has very limited application - primarily to appeals and certain applications, not the categories listed in options A, B, and C.