Help me with this Part Please

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur