The correct answer is option 'C' - High productivity of land.

Explanation:
Indian agriculture faces several challenges, but high productivity of land is not one of them. Let's examine each of the given options to understand why:

a) Fragmentation of landholding:
Fragmentation of landholding refers to the division of agricultural land into smaller and scattered plots. This is a significant problem in Indian agriculture. Due to inheritance laws and population growth, land is continuously subdivided, resulting in small and uneconomical landholdings. Fragmentation makes it difficult to adopt modern agricultural practices and hampers economies of scale.

b) Dependence on seasonal rainfall:
Indian agriculture is heavily dependent on monsoon rainfall, as the majority of the country's agricultural land lacks irrigation facilities. Erratic rainfall patterns, droughts, and floods can severely impact crop production. This dependence on seasonal rainfall is a major challenge faced by Indian agriculture.

c) High productivity of land:
The statement mentions that high productivity of land is not a problem faced by Indian agriculture. However, it is important to note that while India has seen significant improvements in agricultural productivity over the years, there are still regions and crops where productivity needs to be enhanced. Therefore, it is incorrect to say that high productivity is not a concern at all.

d) Disorder in marketing of agricultural products:
Disorder in marketing of agricultural products is a common problem in Indian agriculture. The lack of an efficient and organized marketing system leads to price fluctuations, exploitation of farmers by middlemen, and inadequate market infrastructure. Farmers often struggle to get fair prices for their produce, resulting in income instability.

In conclusion, out of the given options, the problem that is NOT commonly faced by Indian agriculture is high productivity of land. However, it is important to acknowledge that enhancing productivity in certain regions and crops is still a concern for the Indian agricultural sector.