12 year old kwan, is worried because his twin sister has suddenly grown taller and more physically mature than he. his parents should A. reassure him that the average boy is one or two years behind the average girl in the onset of the growth spurt B. tell him that within a year or less he will grow taller than his sister C. tell him that one member of each fraternal twin pair is always shorter D. encourage him to exercise more to accelerate the onset of his growth spurt

12 year old kwan, is worried because his twin sister has suddenly grown taller and more physically mature than he. his parents should

A. reassure him that the average boy is one or two years behind the average girl in the onset of the growth spurt
B. tell him that within a year or less he will grow taller than his sister
C. tell him that one member of each fraternal twin pair is always shorter
D. encourage him to exercise more to accelerate the onset of his growth spurt

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