Final answer:
The landlocked country that shares its western border with Iran and eastern border with Pakistan is Afghanistan.
Step-by-step explanation:
The landlocked country that shares its western border with Iran and eastern border with Pakistan is Afghanistan. None of the other options provided (Iraq, Iran, or Israel) are landlocked, and they do not share borders with both Iran and Pakistan. Iraq does share a border with Iran, but it also has access to the Persian Gulf and shares a border with several other countries, such as Jordan and Saudi Arabia. Iran, being one of the bordering countries mentioned in the question, cannot be the answer. As for Israel, it is located on the shores of the Mediterranean Sea and does not share borders with either Iran or Pakistan. Therefore, the correct answer is b) Afghanistan.