I’m confused lol ?? is there supposed to be a pic ??
<span>c. the number of workers varies from platform to platform depending on the size, conditions and necessity. The average is around 20, however this number could fall in the future as many of these jobs are being taken over by robots.</span>
Cautious means "careful" and especially careful to avoid potential dangers or obstacles: so the word with a similar meaning is a. Careful (they're synonyms).
Optimization- make something as good as possible
the other could be tolerate