English

"Insouciance" means a casual lack of concern or indifference, which aligns with the meaning of "unconcerned." The other options do not convey this meaning.

The correct preposition to use with 'amused' in this context is 'with', as it indicates the means by which the amusement was caused. Therefore, 'My friend amused us with funny jokes' is correct.

The word "assert" means to state or declare something confidently or forcefully. Among the options, "claim" is the closest synonym as it also means to state something as true. The other options do not convey the same meaning.

The word "assail" means to attack or criticize violently. Among the options, "attack" is the correct synonym. The other options do not share this meaning.

A symposium is a formal meeting or conference for discussion on a particular subject, making 'conference' the correct synonym.

The word "desultory" means lacking a plan, purpose, or enthusiasm, often disconnected or random. "Disconnected" best matches this meaning among the options, while "thoughtless" relates more to carelessness, "slanderous" to false statements, and "concentrated" is the opposite of desultory.

The word 'exonerated' means to be officially cleared from blame or charges, which fits the context of being cleared from all charges. The other options do not fit: 'liberated' means freed but not specifically from charges, 'apprehended' means caught, and 'judged' means evaluated but not necessarily cleared.

The word "implement" means to put into effect or carry out a plan or action. Therefore, "carry out" is the correct synonym among the options provided.

The word "ascribe" means to attribute something to a cause or source, making "attribute" the correct synonym. The other options do not convey this meaning.

The word "immolate" means to sacrifice, especially by burning. Among the options, "sacrifice" is the closest synonym, making option D correct.