Sheila Put Some of Her Personal Belonging in a Wal-Mart

Sheila put some of her personal belonging in a Wal-Mart bag to carry with her while she walked through a local park.She often walked in this park even though it was known as a place where drug deals were made.As Sheila was walking,she was approached by a police officer and while he spoke with her,he casually took the Wal-Mart bag and began looking through it.Sheila protested,but the officer continued to look.The officer's actions were a violation of Sheila's constitutional rights because

A) she had a reasonable expectation of privacy in the bag and its contents
B) the bag and its contents had an intimate relation to Sheila,its owner
C) Sheila objected and the officer should have honored this by stopping the search
D) both a and b
E) both b and c