According to the following graph, which shows the elongation rate at the plus and minus ends of actin filaments as a function of actin subunit concentration, at what concentration (A to E) does the total length of the filament remain more or less constant with time (i.e. steady-state treadmilling occurs)? 
Definitions:
Amniocentesis
A procedure for drawing and examining fetal cells sloughed off into amniotic fluid to determine the presence of various disorders.
Blastocyst
A stage within the germinal period of prenatal development in which the zygote has the form of a sphere of cells surrounding a cavity of fluid.
Nourishment
The substances necessary for growth, health, and good condition, often gained through the consumption of food and drink.
Fetal Movements
Refers to the physical movements made by a fetus within the uterus, which can begin to be felt by the mother around 18 to 25 weeks into pregnancy.
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