Answer: 4. Language barriers
Explanation: Problem-solving is a process that requires tact and assertiveness. It is an act that when effectively applied, can help solve puzzles and resolve certain problems. There are four stages in problem-solving which are:
• Identifying the problem
• Creating alternative solutions
• Analyzing the alternative solution for the best results
• Properly executing the best alternative
All these factors of problem-solving can encounter a lot of barriers. However, the most uncommon barrier (in the options provided) during problem-solving is the language barrier.