I take it that you must be doing BINOMIAL EXPANSION. You should also be familiar with p and q, or probability of success (p), and probability of failure (q). 

Therefore, with p being .3, q MUST = 1 - .3, or .7

 now becomes: 

Now, as we have a binomial being raised to the 5th power, we're going to have 6 (six) expressions after the binomial has been expanded.

All choices have 6 expressions so none of the choices can be eliminated.

You now need to use what you know about the BINOMIAL EXPANSION formula, and PASCAL'S TRIANGLE, to help you get your answer.

I'll give you a HINT: It's NOT choice a. 

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