To a british prime minister, parliamentary performance means

a. approving a bill passed by parliament.
b. engaging in rapid-fire discussion with mps.
c. counseling mps with personal problems.
d. mediating disputes between lords and commons.
e. determining when to call an election.

b. engaging in rapid-fire discussion with MPs.

Explanation:

Q & A sessions, open, bitter and lively discussions in the House of Commons are part of the daily routine of a British prime minister, a direct expression of transparency, checks and accountability in a democracy.

i would go with the last one

a. favoring native born americans over immigrants.