Explanation:

Let’s break this down:

- The relationship between ALWAYS and NEVER is one of opposites—total absolutes, but in reverse. Always means "at all times," while never means "at no time." They’re direct antonyms.

- Option 1: often : rarely

This fits. "Often" is frequent, "rarely" is infrequent—they’re on opposite ends, but not as absolute as always/never. Still, their relationship is clearly antonymic.

- Option 2: frequently : occasionally

These aren’t quite opposites. "Occasionally" means sometimes, but not the clear antonym of "frequently."

- Option 3: constantly : frequently

Both mean "a lot" or "very often." They’re close in meaning, not opposites at all.

- Option 4: intermittently : casually

These don’t oppose each other or relate strongly. "Intermittently" means irregularly, "casually" is about manner, not frequency.

Here’s what this means: Option 1 is the only pair that mirrors the antonym relationship of ALWAYS : NEVER.