The answer is: d.
Firmit, Trim, Jet. In general, the greater the size of the monomer molecule, the less is the exothermic heat of reaction on setting and mechanical properties is accomplished mainly through the filler. An increase in filler content reduces the relative amounts of exothermic heat and contraction while increasing the strength of the set material.
For light-activated systems the amount of filler is determined by the manufacturer; for the other systems it is desirable to incorporate as much filler as possible without interfering in the handling or manipulation characteristics of the material.
Contemporary Fixed Prosthodontics, 2nd ed. Rosenstiel et al
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