C. Incomplete sentance. Suboridinate clause.
The girl riding her bike is not enough to be a full sentance.
Some things you could do to fix it:
The girl was riding her bike.
The girl riding her bike was very pretty.
The girl was riding her new bike.
Answer: The simple present passive expresses discrete actions or states in the present or near future while moving an object from an active sentence into the subject position
Answer:
a. participial phrase
Explanation:
I hope this helps you and I'm sorry if it's wrong