In the following question, the sentence given with a blank is to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
One must read the Terms and Conditions ________.

The blank requires an adverb to modify the verb 'read'.
carefully means with close attention to avoid mistakes, which fits the context perfectly since legal agreements require precise reading.

committedly is not a standard or appropriate adverb in this context.

scrutiny is a noun and cannot modify a verb directly.

merely means just or only, which distorts the intended meaningful advice.