Based on the premise "If it is known, however, that other contributions in a significant amount were made, that fact (for example, expressed as a percentage of the total program) shall be reported even if the exact amount of the contribution is not known.", can we conclude the hypothesis "If we know that other contributions were made, we don't have to report them, as long as we don't have concrete numbers." is true (see options)?

Possible answers: (a). yes. (b). it is not possible to tell. (c). no.
(c).