When a passage lists multiple drawbacks, focus on the one explicitly tied to the subject in the question — here, the author clearly connects length with frequent amendments.
The passage states that an overly long constitution says too much on too many subjects, making it inflexible and requiring frequent amendments to remain relevant.
Each amendment then lengthens it even further, which compounds the problem.
Option (a) is incorrect — the cost of publication is never mentioned as a disadvantage.
Option (b) is incorrect — while complexity might make a long constitution harder to read, the specific drawback highlighted in the passage is the need for frequent amendments.
Option (d) is incorrect — enforceability issues are not linked directly to the length of a constitution in the passage.
Thus, (c) is correct because it aligns exactly with the drawback mentioned by the author.