English

The word "unequivocal" means clear and unambiguous, which aligns closely with the synonym "unmistakable." The other options do not share this meaning.

The word 'amend' means to make changes or alterations to something, typically to improve it. Therefore, 'alter' is the correct synonym among the options provided.

The word "abstain" means to deliberately avoid or refrain from doing something. Among the options, "refrain" is the closest synonym, meaning to hold oneself back from an action.

The word "inexpedient" means not suitable or advisable, so "unadvisable" is the correct synonym. The other options do not share this meaning.

The word "querulous" means complaining in a petulant or whining manner, so the synonym "complaining" is the correct choice.

The word 'advert' is a shortened form of 'advertisement' and is used to refer to a public notice or announcement. The verb 'refer' means to direct attention to something, which is closest in meaning to 'advert' in the sense of mentioning or pointing out. The other options do not relate to the meaning of 'advert'.

The word 'whorl' refers to a pattern of spirals or concentric circles, so the synonym 'spiral arrangement' correctly matches its meaning.

The word "collation" primarily means a light meal or snack, especially one taken in the evening. Therefore, the synonym "light meal" (option B) is correct.

The word 'impede' means to delay or prevent progress, so its synonym is 'hinder,' which means to create difficulties or obstacles. The other options have opposite or unrelated meanings.

The word "implant" means to insert or fix something firmly in a place, often inside the body. "Transplant" similarly means to transfer or move something, especially living tissue or organs, from one place to another, making it the closest synonym among the options. The other options do not convey this meaning.