Arnold, who is single, sold his principal residence on April 10, 2018, and excluded the realized gain under § 121 (exclusion on the sale of a principal residence). On April 12, 2018, he purchased another principal residence, which he sells on January 12, 2019, for a realized gain of $80,000. Can Arnold exclude the $80,000 realized gain on the January 2019 sale if his reason for selling was:

a. His noisy neighbors? Explain.

b. A job transfer to another city? Explain.