challenge: What is the primary food source for the larvae of Trifurcula salvifoliae?
  
  A. Salvia officinalis subsp. lavandulifolia roots
  B. Salvia officinalis subsp. lavandulifolia stems
  C. Salvia officinalis subsp. lavandulifolia leaves
  D. Salvia officinalis subsp. lavandulifolia flowers
  Answer: 