"Few" is used with countable nouns to indicate a small number of something. "Little" is used with uncountable nouns to indicate a small amount of something. In this case, "time" is an uncountable noun, so the correct choice is "a little time." This means the speaker has a small amount of time available.
c) a little
"Few" is used with countable nouns to indicate a small number of something. "Little" is used with uncountable nouns to indicate a small amount of something. In this case, "time" is an uncountable noun, so the correct choice is "a little time." This means the speaker has a small amount of time available.