Q--Can rowing competitions take place indoors?
A--My step-by-step reasoning: Rowing is a sport involving propelling boats. Boats need a large body of water in order to move. There are no indoor facilities big enough to host a pool with enough size for a boating competition.
So, the answer is no.

Q--Are Christmas trees typically deciduous?
A--My step-by-step reasoning: Christmas trees are almost always pine trees. Christmas trees are green all year round.
So, the answer is no.

Q--Would lumberjacks get full after eating three dosa?
A--My step-by-step reasoning: Dosa are thin rice pancakes from South India. One dosa is approximately 110 calories. The average lumberjack would eat 8000 calories per day.
So, the answer is no.

Q--Did Charlemagne have a bar mitzvah?
A--
My step-by-step reasoning: Charlemagne was a Roman Catholic. Bar mitzvah is a coming of age ceremony in Judaism.
So, the answer is no.