What may be a limitation if you replace a TTL device for an LS device?

Question $23$ options:

A$)$

The lower speed of the LS device may cause issues.

B$)$

The lower speed of the TTL device may cause issues.

C$)$

The lower bandwidth of the TTL device may filter out some signals.

D$)$

The lower bandwidth of the LS device may filter out some signals.