Question 975641
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Yes, A is correct.  The following are all logically equivalent statements:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \phi\ \text{implies}\ \psi]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \text{if}\ \phi\ \text{then }\ \psi]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \phi\ \text{is sufficient for }\ \psi]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \phi\ \text{only if}\ \psi]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \psi\ \text{if}\ \phi]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \psi\ \text{whenever}\ \phi]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \psi\ \text{is necessary  for }\ \phi]


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \