Which of the Following Examples Would Most Likely NOT Be

Which of the following examples would most likely NOT be considered evidence of age discrimination?

A) Bob is a retired engineer who works part-time as sales staff at a "big box" home center. The store manager refers to Bob as "Grandpa Bob."
B) A modeling agency has sent an 52-year-old man to pose for a photo shoot for a teen-oriented product line. The shoot director was over heard to say on the phone, "What were you thinking? I gave you our target customer profile!"
C) When James was sent to classes to update his computer skills, his supervisor commented that she was sure "old dogs could learn new tricks."
D) The HR managers at a non-profit organization refer to the informal policy of laying off the most senior and highly-paid employees first as the "age before beauty" policy.