Like W. T. Stace, Stephen Toulmin calls atoms useful fictions. However, Toulmin's stand on the existence or non-existence of sub-microscopic entities is importantly different. In what way?

While Stace believes atoms help explain causal effects, Toulmin does not

Unlike Stace, Toulmin believes that we can eventually demonstrate the existence of all sub-microscopic entities

Stace's view, with an emphasis on human minds, better explains sub-atomic quantum phenomena, which is observer-dependent

Toulmin believes that when we can experimentally produce submicroscopic entities, we are justified in calling them more than explanatory fictions

None of the above