Articulate started the e-learning blog, where the theory was simple

Articulate started the e-learning blog, where the theory was simple – consumers showing a greater willingness to buy its tools if they find multiple uses for them.

A. where the theory was simple – consumers showing
B. which had the simple theory of consumers showing
C. with a simple theory of consumers showing
D. whose theory was simple – consumers show
E. with a theory that is a simple one – consumers show

Option A - Where is incorrect for blog

Option B - which refers back to blog , meaning blog had different theory . Blog cannot have a theory

Option C - With a simple theory of consumer , it doesn't make sense

Option D - Whoes correctly refers back to Articulate . makes sense lets keep it

Option E - With a theory that is simple one , its awkward . dump it

Correct me if I'm wrong