Baby jimmy's parent places a brand new rattle in his crib, and jimmy immediately picks it up and tries to mouth the rattle and when it shakes it makes noise. jimmy immediately tries shaking the rattle different ways to see how the sound changes. he seems to enjoy this activity. piaget would say that this is an example of:
a) substage 2: first habits and primary circular reactions
b) substage 1: simple reflexes
c) substage 3: secondary circular reactions
d) substage 4: coordination of secondary circular reactions

c) Substage 3: Secondary circular reactions

Explanation:

The Secondary circular reactions occur in between 4 to 8 months after birth. In this stage the child is curious about the world and wants to know what reactions does he/she get when they interact with the world.

Here, Jimmy wants to know what will happen if he puts the rattle in the mouth. He wants to know what will happen if he shakes the rattle differently. Hence, Jimmy is in third substage where Secondary circular reactions occur.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.