Japanese wooden architecture uses a series of cross- and to support the elaborate curved roofs of early temples

Japanese wooden architecture uses a series of cross- and counter- Beams to support the elaborate curved roofs of early temples
Beams as a building foundation is more complicated than the normal foundation but it create a stronger foundation.
The japanese started to used this because they have to experience constant earthquake due to their Geographical location

Iwould say d) signed unknown street singers who brought original songs to record.

What i think is that it adds loudness for preachers/church choirs. it is also able to hold up a lot of weight without pillars. : )) idek tho