Answer: I believe your answer would be number 2, adjust.
Explanation: The dictionary definition of adapt is as follows: make (something) suitable for a new use or purpose; modify.
The dictionary definition of adjust is as follows: alter or move (something) slightly in order to achieve the desired fit, appearance, or result.
Amend means, more or less, to fix something, presumably something that is broken and/or incorrect, and acquire means to gain something in some way, such a buying or receiving it. Appear means to come into someone's line of sight.
Looking at the definitions of all these words, we can see that adjust and adapt are quite similar, and from this information we can infer that the most suitable answer would be number 2, adjust.
Hope this helped you!!