(b) That's right. A's statement would not become a term of the contract. The reason is that what A has said is easily recognisable as the sort of exaggerated praise that suppliers of goods and services often use to excite buyers and encourage sales. Such statements are not intended to be taken seriously, and this is generally easily recognised by both the contracting parties. For this reason, such statements are not enforceable.
Such statements are often referred to as 'puffs' or 'puffery'. This is because, on analysis, they are without any real or measurable substance. They consist of nothing but 'hot air'.