Correct answer: A. Difficulties like examination in London and age limits
Explanation: The direct answer is Option A: difficulties such as taking the examination in London and restrictive age conditions remained. The Charter Act of 1853 introduced the principle of open competition for recruitment to the covenanted civil service, but a formal opportunity did not mean equal practical access. Indian candidates generally had to travel to London, which required considerable money, time, and social support. The examination was conducted in English and the age limits and examination conditions could also disadvantage Indian aspirants. Step by step: the Act opened competition in theory; the examination location, cost, language, distance, and age rules created practical obstacles; therefore Indians still found it difficult to enter the higher civil services in large numbers. Option A is correct because it distinguishes legal opportunity from real accessibility. Option B is wrong because the Indian National Congress was founded later, in 1885, and did not stop this examination. Option C is wrong because Indians did not automatically receive high posts; competition and discrimination still limited appointments. Option D is wrong because civil-service posts were not reserved for all peasants. The useful exam distinction is: opening a door legally does not guarantee that everyone can actually reach or pass through it.