Answer:
The correct answer is option - B. tertiary circular reaction.
Explanation:
The sensorimotor stage is made up of 6 sub-stages that starts from birth and last up to 24 months. These 6 sub-stages are reflexes (0 to 1 month), primary circulation (1 to four months), secondary circular reactions (four to eight months), coordination of reaction (eight to twelve months), tertiary circular reaction (twelve to eighteen months) and lastly early representational thought (18 to 24 months).
The baby carter is in the tertiary circular sub stage of sensorimotor as it is the stage that is characterized by exploring and trying new actions. It is the fifth stage in which babies start the trial and error experimentation as carter walk around with box until he bumps his head.
Thus, the correct answer is option B. tertiary circular reaction.
Answer:
Remain Calm
Explanation:
Freaking out will not let you have a steady mind, so you won't have a right mind set to be cautious and make correct choices.
Answer:
1,800,000,000 ways
Explanation:
Given


Required
Number of ways of selection
From the 8 digits; the first must be nonzero (i.e. any of 1 - 9).
There are 9 ways of selecting this:
The other 7 digits could be any of the 10 digits and there may be repetition.
Each of the digits can be selected in 10 ways. So, the number of ways of selecting the 7 digits is: 
<u>For the alphabets:</u>
The first can be selected from the
letters while the second can be selected from the remaining 
So, the number of ways the alphabets can be selected is: 
<u>Total number of selection is:</u>

