Janel owns five small businesses, each of which has its own manager and employees. Janel spends the following number of hours this year working in the various businesses: Business A, 130 hours; Business B, 160 hours; Business C, 110 hours; Business D, 120 hours; Business E, 100 hours. Which of the following statements is correct?

a. Businesses A, B, C, D, and E are all significant participation activities.

b. Businesses A, B, C, and D are all significant participation activities.

c. Janel is considered a material participant in Businesses A, B, C, and D.

d. Both b and c are correct.