Which sentence is a statement of fact? a) this is the most attentive and hard-working biology class i've had the pleasure of teaching during my thirty years here. b) i think the dissenters can rest assured that the adoption of the curriculum has been a beneficial change for all of north valley. c) half of the group members hold clipboards, and the rest carry a wide array of equipment, including nets, magnifying glasses, and vials. d) the school board's proposed curriculum may be unconventional, but it is also more inventive and pragmatic than many of the obsolete courses the school offers annually.