A health education specialist is designing a program to increase physical activity among sedentary office workers. The following objective is drafted: 'By the end of the 6-month program, 50% of participants will report engaging in at least 150 minutes of moderate-intensity physical activity per week.' Which component of the SMART objective criteria is best represented by '50% of participants'?
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A
Specific
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B
Measurable
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C
Achievable
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D
Time-phased