The correct answer is option D, that Engels once personally tutored Karl Marx is not true.
“Engels personally tutored Karl Marx” this statement cannot be followed as Engels founded the Marxist theory along with Karl Marx in 1845. Engels was a German Communist ( helped in the foundation of the communist party), hence, his writings with no doubt followed by his party. Das Kapital was a major work of Karl Marx, in which he expounded his theory of the capitalist system, the second and third volume of this work was edited by Engels.
Hence, this statement is not right that Engels once tutored Karl Marx personally.
c. Nigeria
b. Gold Coast (Ghana)
d. Biafra