Which One of the Following Situations Is the Best Example

Which one of the following situations is the best example of parallel play?

A) John and Joey sit next to each other beside a pile of blocks. Each one is building a tower and occasionally watching what the other is doing.
B) As Paige and Penny make valentine cards for their parents, they agree to share the markers and glue they will need for their creations.
C) Tammy and Tabitha are playing house. Each girl contributes to the unfolding story, picking up on the cues of the other.
D) Wendy watches in fascination as Wade paints with finger paints. She is mesmerized by the way the paint moves under his hands.