In order for Member States to be able to reject an application as inadmissible on the basis of the concepts of first country of asylum or safe third country, an individual assessment of the particular circumstances of the applicant should be carried out, including of any elements submitted by the applicant explaining why those concepts would not be applicable to him or her. Where the applicant is an unaccompanied minor, the competent authority should take into account the best interests of the child, in particular concerning the availability of sustainable appropriate care and custodial arrangements.