Step 1: Recall Brehm’s reactance theory.
This theory suggests that when people perceive their freedom of choice as being threatened, they may experience psychological reactance, motivating them to resist the restriction.
Step 2: Apply to spitting signs.
- A strong prohibitory sign (e.g., "Strictly No Spitting") threatens autonomy more strongly, increasing resistance and making people more likely to spit.
- A mild prohibitory sign (e.g., "Please avoid spitting") reduces the feeling of restriction, and hence reduces reactance, making compliance more likely.
Step 3: Eliminate other options.
(B) is false because stronger restrictions trigger more resistance.
(C) is false since no guidance may not discourage spitting.
(D) is false because signs influence behavior through perception of freedom.
Therefore, (A) is correct.