Which activities have slack, and how much?

multiple choice $2$

APicture $2$ weeksPicture CPicture $3$ weeksPicture FPicture $1$ week.

BPicture $1$ weekPicture HPicture $2$ weeksPicture FPicture $4$ weeks.

CPicture $5$ weeksPicture FPicture $2$ weeksPicture GPicture $2$ weeks.