Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Calculate standard deviation of petiole thickness'?

A. Visit inflorescence daily from the moment of opening. Note dates when last female flowers and first male flowers of next inflorescence open. Record number of days betwen these dates as a positive number if last female flowers of current inflorescence come first, as a negative number if first male flowers of next inflorescence come first. Observe on 30 palms, calculate mean.
B. Measure the girth or circumference of the stalk just below the first spikelets from 30 randomly selected palms. Calculate standard deviation.
C. Visit inflorescence daily from the moment of opening. Note dates when last female flowers and first male flowers of next inflorescence open. Record number of days betwen these dates as a positive number if last female flowers of current inflorescence come first, as a negative number if first male flowers of next inflorescence come first. Observe on 30 palms, calculate standard deviation.
D. Measure petiole thickness at insertion of first leaflet from 30 randomly selected palms. Calculate standard deviation.

Answer: Measure petiole thickness at insertion of first leaflet from 30 randomly selected palms. Calculate standard deviation.