Which of the following was one of the significant setbacks experienced by entrepreneur Matthew Griffin when he was starting Combat Flip Flops?

a$.$ Factory workers went on strike to protest American ownership of the company.

b$.$ Griffin found it difficult to procure all the raw materials that he needed because the United States government was discouraging business startups in Afghanistan.

c$.$ Initial products were made with low quality standards and could not be sold.

d$.$ Griffin was forced to move some production to Japan because the processes involved were more technologically advanced than Afghanis could manage.