Amixed economy has strong elements of both and economies.
a. planned . . traditional
b. market . . planned
c. market . . traditional
d. planned . . command

B. market . . . planned

A mixed economy has strong elements of both market and planned economies.

A mixed economy has both market and planned  economies as strong elements

Option B.  

Explanation:

An economic system that combines the market economies elements and planned economies elements, free markets with state intervention or combining private and public enterprise.  

When the market mixes with the state interventions it is known as capitalist market economies.  

The nature of integrated private and public enterprises will be political. In mixed economy the main characteristics are that the private ownership is more predominant and the mainly acting force will be the capital accumulation.