Final answer:
The statement about tautologies being logiclly equivalent to each other is true because tautologies are always true, making them equivalent. The term closest in meaning to 'hypothesis' is 'suggestion'.
Step-by-step explanation:
The statement 'Every tautology is logically equivalent to every other tautology' is true. A tautology in logic is a statement that is true by necessity or by virtue of its logical form. Since tautologies are always true, regardless of the truth values of their components, they are equivalent to each other. For example, 'It is raining or it is not raining' is a tautology and is logically equivalent to another tautology like '2+2=4 or 2+2≠4'. Both statements are true in every possible scenario.
As for the word closest in meaning to hypothesis, the correct answer is d. suggestion. A hypothesis is a proposed explanation or a tentative theory that is yet to be tested. Unlike a fact, law, formula, or conclusion, a hypothesis is a starting point for further investigation and is therefore best matched with the term 'suggestion'.