Final answer:
Conditional statement in Mathematics
Step-by-step explanation:
In this question, the subject is Mathematics as it involves logical reasoning and conditional statements. The given information introduces two variables: A (Reese Witherspoon wins best actress) and B (Martin Scorsese wins best director). The statement 'Reese Witherspoon wins best actress only if Martin Scorsese wins best director' can be translated as A if B.
This statement is an example of a conditional statement where the consequence (A) occurs if and only if the condition (B) is satisfied. If Martin Scorsese wins best director (B), then Reese Witherspoon wins best actress (A). However, if Martin Scorsese does not win best director, then Reese Witherspoon cannot win best actress. Mathematically, this can be represented as A if B, or A → B.