If an adaptive behavior occurs rarely, ___________________ is given to increase the deficit.

positive reinforcement

the correct answer is option 2: positive reinforcement

If an adaptive behaviour (i.e., a desirable or helpful behavior) occurs rarely, positive reinforcement is given to increase the deficit. For example, if a child does not do eat properly, positive reinforcement may be used by the child’s mother by giving the child’s favourite chocolate/toffee whenever s/he eats properly. The positive reinforcement of chocolate will increase the behaviour of eating properly timely.