To What Phenomenon Does "Solow's Paradox" Refer

To what phenomenon does "Solow's Paradox" refer?

A) the failure of the Solow growth model to incorporate endogenous growth variables
B) the absence of any measured effect of new computer technology on productivity statistics.
C) the absence of any long term effect of saving on economic growth rates in the Solow growth model
D) the failure of the Solow growth model to predict non-convergence of poor countries