Answer:C. 3Step-by-step explanation:Given expression is:[tex]({3^{\frac{1}{7}})^7[/tex]We know that the rules of exponents are used to solve these kind of questions.When there is exponent on exponent like in this question 1/7 has an exponent of 7 , the exponents are multiplied.So,[tex]=3^{(7*\frac{1}{7} )}[/tex]The 7's will be cancelled out and remaining power will be 1[tex]=3^1\\=3[/tex]Hence, option C is correct ..