Ithink it might be b. but i'm not sure : /

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )

i think if it were me i whould divide 300 dide 15

step-by-step explanation:

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.