Mary, Dorothy, Sylvia, Ella, and Kathy are sitting on a bench in the park.
Mary is not sitting on the farthest right side;
Dorothy is not sitting the farthest to the left.
Sylvia is not sitting the farthest to the left nor the farthest to the right.
Kathy is not sitting next to Sylvia, and Sylvia is not sitting next to Dorothy.
Ella is sitting to the right of Dorothy (but may or may not be next to her).
Which girl is sitting the farthest to the right?

Ella

Explanation:

Process of elimination will help here

5 girls, 1 is farthest left and 5 is farthest right

"Mary is not sitting on the farthest right side; "

"Dorothy is not sitting the farthest to the left."

"Sylvia is not sitting the farthest to the left nor the farthest to the right."

Mary could be in seats 1 2 3 4.

Dorothy could be in seats 2 3 4 5.

Sylvia could be in seats 2 3 4. And not next to Dorothy

Kathy could be anywhere not next to Sylvia

Ella is sitting anywhere on the right of Dorothy

I suggest assigning each girl a number 1 to 5 and then go through the list and see can this arrangement work

Kathy 1

Dorothy 2

Mary 3

Sylvia 4

Ella 5

a. is the correct answer