Howie Just Bought a New Digital Camera to Replace His

Howie just bought a new digital camera to replace his old one, which works perfectly fine and would sell on eBay for $100. The fact that Howie would not pay $100 for the old camera, yet he continues to let it sit unused his closet, is explained by:

A) the implicit cost of ownership bias.
B) the explicit cost of ownership bias.
C) the explicit cost of sales bias.
D) ignoring sunk costs.