Answer:
B. Oftentimes, our family travels to monuments and museums.
Step-by-step explanation:
Oxymoron is a figure of speech in which contradictory words are placed in the same sentence. These contradictory or opposite ideas bring a literary effect and helps the writer present the ideas more exclusively.
The sentence in option (b) presents an example of an oxymoron. The words that present the opposite or contradicting ideas are 'often' and 'times'. The family here travels to monuments and museums 'oftentimes' that brings the meaning of 'often' and 'times'.