The missing word would be tiene.
Answer:
La dinámica de su relación con Diego Rivera.
Explanation:
In this exercise, you have to select the correct answer to complete the sentence given about the Frida Kahlo's painting 'Frida y Diego Rivera (1931)'.
The correct answer is 'la dinámica de su relación con Diego Rivera' because in the painting you can see both of them (Frida and Diego), and Kahlo painted it one year after they got married. In the top of the painting you can read a text written by Frida that says she painted herself and her husband in California, San Francisco for a friend of theirs. Some people say that in the painting you can see how Frida believed that her husband was a superior painter because he has brushes in his hand and she has not.
