Let's go through your answers one by one and check if they are correct:
For question 3, you chose "<Infants cannot express emotions for about the first month.>" as the false statement. This is indeed the correct answer. Infants are capable of expressing emotions through facial expressions even in the first month of life.
For question 4, you chose "operant conditioning" as the correct answer. This is the correct choice. Linda's behavior of sitting on the floor and crying to get a piece of candy is an example of operant conditioning, as it involves learning through consequences (in this case, receiving candy).
For question 10, you chose "psychometric, Piagetian" as the favored approach for Alfred and Jeanne respectively. This is the correct answer. Alfred, with a mathematics background, would likely favor the psychometric approach, which emphasizes quantitative measures of variables. Jeanne, on the other hand, believes in more qualitative developmental outcomes, aligning with the Piagetian approach.
For question 18, you chose "habituation" as the correct answer. However, the correct answer is "operant conditioning." When a child learns to behave in a specific way to obtain a specific result, it is an example of operant conditioning, as the behavior is influenced by its consequences.
For question 19, you chose "cephalocaudal" as the correct principle of development. This is the correct answer. The sequence of babies waving their arms, then moving their hands towards objects, and finally using their fingers exemplifies the cephalocaudal principle of development, which refers to development occurring from head to toe.
To summarize, your answers for questions 3, 4, 10, and 19 are correct. However, your answer for question 18 is incorrect. The correct answer for question 18 is "operant conditioning."