The correct answer is C. little.
A few means “a small number of”. It is used to refer to a number of things that is less than a dozen, but more than one. For example, you might say “I have a few friends” or “I have a few questions”.
Little means “a small amount of”. It is used to refer to a quantity of something that is less than a lot, but more than none. For example, you might say “I have little money” or “I have little time”.
In the sentence “I had to walk 5 km yesterday as I had little rupees for fare”, the speaker is saying that they
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