The correct option is D 3, 3 and 3
Expressions are made up of terms. A term can be a constant, a variable, product of constant and variables or product of variables.
Each term in an algebraic expression is separated by an arithmetic operator + or - .
(i) 6x3+8x2−4x
has three terms 6x3,8x2 and −4x.
(ii) 15xy3+21x2−16
has three terms 15xy3,21x2 and −16.
(iii) 19x2+8x2+4xy−2
=27x2+4xy−2
(Since 19x2 and 8x2 are like terms)
has three terms 27x2,4xy and −2.
Therefore, all the given expressions have three terms.