Which number produces an irrational number when added to 1/3

The answer is C.

When you add a rational number (1/3) to an irrational number, you always get an irrational sum.
2*pi is irrational because it cannot be expressed as a ratio of two integers. It is also a nonterminating nonrepeating decimal.

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?