The comparison to an invisible spring is pretty accurate. What kind of forces do you think are
in this "spring" between molecules? Or, what
kind of force do you think attracts and then
repels the molecules (or atoms in a molecule)?

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

i think is conclusions.i think so