Rete testis to vas deferens

Vasa efferentia are the ductules leading from

(1) Epididymis to urethra
(2) Testicular lobules to rete testis
(3) Rete testis to vas deferens
(4) Vas deference to Epididymis

What is That Factor that will help this to get Stabled?
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+m eqaul at ortho and meta position but at -i less at para as compare to ortho position of OH grp answer will be C