To prevent the spread of communism.
Subsistence crops are grown for the direct benefit of the farmer and their family. Cash crops are grown to deliberately be sold. ... Cotton makes a poor subsistence crop because you can't eat it and it has to be processed before it's useful (ginned, spun and woven)
I am not completely sure but would it be answer number 4? Sorry if I am wrong, it just makes more since to me.
(c)The new ruler <u><em>Seku Amadu</em></u> wanted to make it more modern mosques.
Seku Amadu appears to have disapproved of the existing mosque and allowed it to fall into disrepair.This would have been the building that Caillié saw. Seku Amadu had also closed all the small neighbourhood mosques.Between 1834 and 1836, Seku Amadu built a new mosque to the east of the existing mosque on the site of the former palace. The new mosque was a large, low building lacking any towers or ornamentation.