Question

what is mariana’s invention supposed to do?
wash and dry students’ bicycles
protect bikes from bad weather
keep bikes from being stolen
remove rust from bicycles

Explanation:

The question is about Mariana's invention's function. The selected option (the blue - circled one) is "remove rust from bicycles", so we identify this as the answer based on the selection in the provided image.

Answer:

The blue - circled option: remove rust from bicycles