The questions would like to know the most relevant synonym of the word underlined.
The word underlined in the first question is "account". Account can have several meanings such as a bank feature that lets you keep money with them, your side of a story or an explanation of sorts. In this case it is an explanation as the man in question was being asked to explain why he was at the scene of the crime.
For the second question, the underlined word is "fantastic". The relevant synonym would have to be "wonderful" because when something is said to be fantastic, it means that it is positively very much above average which is another way of saying wonderful.
