In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,

[A].	the algebraic sum of the primary forces must be equal to zero
[B].	the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
[C].	both (a) and (b)
[D].	none of these

Answer: Option C

Explanation:

No answer description available for this question.