Question

analyzing plot development - instruction - level f
\i know you guys are besties, but wow - matching trash
bags? what, are you twins or something?\
\wake up and smell the issues, maya - the streets are
filthy and were trying to do something about it,\ i say,
staring her down.
she taps on her phone, like were wasting her time,
even though she was the one who said something first.
\you think youre environmentalists now, taking care of the
earth?\
what do environmentalists do? learn more.
\maybe we are,\ i scowl at her. \whats it to you?\ i ask
as she walks away.
\great, now our trash is going to get maya talking
trash,\ shan sighs.
\its only maya,\ i say. \and besides, her words dont
rattle me. in fact, what she said got me thinking. twins... i
think we should make it official. lets be the trash twins -
its catchy.\

Explanation:

Maya's initial comment about "matching trash bags" and asking if they're "twins or something" is a form of mockery. Her later statement "You think you're environmentalists now..." also shows her dismissive and mocking attitude towards Savannah and Shan's efforts of bringing trash (presumably collected from the streets) to school as part of cleaning up. There's no indication in the text that she refuses to help throw - away bags (no such action described) or claims they should have cleaned more (her words are more about belittling their current effort).

Answer:

Maya makes fun of Savannah and Shan for picking up trash.