Among the following, what is an obstacle in India's Federal Nation-Building ?

In studies of Indian federalism, the erstwhile Planning Commission was widely criticized as an obstacle to federal autonomy because, as a non-statutory and extra-constitutional central body, it exercised centralized control over development planning and discretionary financial transfers to the States. By contrast, linguistic reorganization of states, the three-language formula and the accommodation of regional parties are regarded as having strengthened federal nation-building.