Discuss Whether the Following Persons Are Currently Engaged in a Trade

Discuss whether the following persons are currently engaged in a trade or business:
a.Katerina owns 35 home sites in and around Orlando.She bought these vacant lots several years ago in hopes to developing them into a subdivision.She begins to develop the lots in the current year.
b.John spends 2 hours a day,5 days a week,managing his investment portfolio.He watches the market and buys and sells securities when he thinks the market is right.His investment strategy is to realize dividends,interest,and long-term gains from holding the investments.
c.Bill lives in Miami and works full-time betting on dog races.Although he intends to win large sums,he has failed to win the big one.He considers his betting activities his job and relies on his meager winnings to support his family.He is devoted to the races and has rarely missed a day betting in over 3 years.
b.John spends 2 hours a day, 5 days a week, managing his investment portfolio. He watches the market and buys and sells securities when he thinks the market is right. His investment strategy is to realize dividends, interest, and long-term gains from holding the investments.
c.Bill lives in Miami and works full-time betting on dog races. Although he intends to win large sums, he has failed to win the big one. He considers his betting activities his job and relies on his meager winnings to support his family. He is devoted to the races and has rarely missed a day betting in over 3 years.