If an infant in the coordination of secondary circular reactions substage of sensorimotor development manipulates a stick in order to bring a desired toy within reach or knocks over one block to reach and play with another one, this would be an example of:

An infant in the coordination of secondary circular reactions sub-stage of sensorimotor development to manipulates a stick in order to bring a desired toy within reach or knocks over one block to reach and play with another one, ia an example of Piaget's Secondary Circular Reactions (4-8 months) of Sensorimotor Stage of Cognitive Development.

Explanation:

Sub - Stage of Secondary Circular Reactions (4-8 months)

During this sub-stage, the child becomes more focused on the world and begins to intentionally repeat an action in order to trigger a response in the environment. For example, a child will purposefully pick up a toy in order to put it in his or her mouth.

Find attached a Picture of the Stages of  Piaget's Cognitive Development

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.