Final answer:
An improper fraction is one in which the numerator is greater than or equal to the denominator. Option B, 168/7, is the only improper fraction listed, with the numerator 168 being greater than the denominator 7.
Step-by-step explanation:
The question asks which of the listed fractions is an improper fraction. An improper fraction is one where the numerator (the top number) is greater than or equal to the denominator (the bottom number). Looking at the options given:
- A. 39/88 is not an improper fraction because 39 is less than 88.
- B. 168/7 is an improper fraction because 168 is greater than 7.
- C. 42/43 is not an improper fraction because 42 is less than 43.
- D. 4% is not a fraction in its typical form, and as a decimal, it would be 0.04, which is not an improper fraction.
Therefore, the correct answer is B. 168/7, which is the only improper fraction.