Our trip to the beach was fantastic and we did many enjoyable things including playing in the sand, eating at delicious restaurants, and watching the sunset from a cruise ship demonstrates clear, parallel structure.
Answer: B
Explanation
In statement A, the word 'we' is used multiple times showing a redundancy error that can be avoided.
In statement C, along with the same redundancy issue, the word 'sunsets' is used instead of sunset. Sunset can be seen only once in a day.
In statement D, the sentence is made complex.