A Fitbit is a wearable device that tracks physical activity of the user, providing metrics which will allow them to adjust daily habits and improve their health.
In the final ten lines of the poem Il Penseroso, the poet aspires to a revelation of devine knowledge to inspire his great poetry. He will devote himself to solitude, contemplating. Among these lines he speaks about sitting in a "peacful hermitage" where "rightly spell" may refer to attachment to natural madic and an interest i the new search for an accurate scientific language. He wants to know and understand nature.
I'm pretty sure it is C. The reasons being that the poem is called "We Wear the Mask". That means that they are showing one thing on the outside, but are saying something different on the inside. Like they are pretending. C makes the most sense because the passage states that they smile on the outside but their souls are crying.