Luxurious indicates something comfortable and expensive while 'luxuriant' means healthy growth, which is apt in the context.Hence B.
New shampoo points to a specific shampoo.So the definite article 'the' is appropriate.Hence A.
'Lama' is a Buddhist monk while 'llama' is an animal, which doesn't suit the context.Hence A.
'Loath' is to be unwilling while 'loathe' is to hate. Hence A.
'Internment' is release from imprisonment while 'interment' is burial.Hence A.
The correct sequence is BAAAA.