What was the ceremony called in which the vassals promised their loyalty to a lord?

According to the world bank, e.u. remittances to senegal were $1,005,728,139$1,005,728,139 in 2015. senegal's gross domestic product (gdp) was $13,779,570,750$13,779,570,750 in 2015. what percentage of senegal's 2015 gdp is represented by the remittances? round your answer to one place after the decimal. remittances as percent of gdp: %% based on the washington post article, e.u. launches $2 billion plan to keep africans from migrating, which explanation correctly explains why senegal's government would or would not implement policies to restrict illegal migration from senegal to the european union? because remittances represent such a large percentage of senegal's gdp, senegal's government faces an incentive to do nothing to stop illegal migration to the european union. because remittances are sent from senegalese workers in senegal to their family members in the european union, senegal's government faces no incentive to crack down on illegal migration. because remittances represent such a small percentage of national income, senegal's government does not find it worth its time to implement policies to prevent illegal migration. because remittances are sent from senegalese workers in senegal to their family members in the european union, senegal's government faces a large incentive to crack down on illegal migration.