What is the 49ers' biggest concern heading into the NFC Championship game against the Lions? – NBC Sports Bay Area and California

The 49ers are the clear favorite over the Detroit Lions in Sunday's NFC Championship Game at Levi's Stadium, but that doesn't mean San Francisco can compete in a Super Bowl for the second time in five seasons.

There are concerns about the 49ers, especially after their shaky performance in a thrilling 24-21 victory over the Green Bay Packers in the NFC divisional round playoff game last weekend.

So what's the 49ers' biggest concern heading into their third straight NFC title game and fourth in five years? The faithful have a chance to vote in NBC Sports Bay Area's latest “Toyota Driving To The Red Zone” poll question on Instagram:

Here are the four options:

– The Lions’ running game is stopped
— Brock Purdy inconsistencies
– Shanahan’s conservative style of play
– Nothing, Niners are on their way to the Super Bowl

Fans can vote HERE.

Coverage of the 49ers-Lions showdown begins Sunday at 2:30 p.m. PT on NBC Sports Bay Area with “49ers Pregame Live” and continues immediately after the game with “49ers Postgame Live.”

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